Most reliable engines: the lowest-risk ones among those analysed
Of the 162 engines we have analysed, the 1.0 and 1.4 Boosterjet presents the least risk according to our index: 6/100 (low risk). Even so, it is not fault-free: it has 4 documented faults and the worst is of low severity.
Ordered from lowest to highest risk index (0–100). Lower risk does not mean zero faults: check the recommended versions of each engine and its main fault. It compares only the engines we have analysed. How it is calculated
- Rank 11.0 and 1.4 Boosterjet
Suzuki
Risk index
6Low risk
Worst severity
Low severity - Rank 2
Risk index
7Low risk
Worst severity
Low severityMain fault
Jerky or harsh automatic gearbox shifts when cold or at low speed (MG HS)2 documented faults · 0 serious
Recommended versions
- Rank 22.0 and 3.0 Ingenium gasolina
Land Rover and Jaguar
Risk index
7Low risk
Worst severity
Medium severityRecommended versions
None with a «Buy» verdict
- Rank 42.0 and 2.2 16v EW10/EW12
Peugeot and Citroën
Risk index
14Low risk
Worst severity
Medium severity - Rank 42.2 MultiJet / BlueHDi (Stellantis)
Fiat, Peugeot, Citroën, Opel and Toyota
Risk index
14Low risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 6MIVEC gasolina
Mitsubishi, Smart, Peugeot and Citroën
Risk index
15Low risk
Worst severity
High severity - Rank 71.0 T3 and 1.3 T4 FireFly Turbo
Jeep, Fiat and Alfa Romeo
Risk index
18Low risk
Worst severity
Medium severityMain fault
Oil consumption and premature turbo wear on the 1.0 T3 and 1.3 T42 documented faults · 0 serious
- Rank 81.0 MPI
Volkswagen, Seat and Škoda
Risk index
19Low risk
Worst severity
Medium severityRecommended versions
- Rank 91.6 Dual VVT-i
Toyota
Risk index
20Low risk
Worst severity
Medium severity - Rank 91.2 8v Fire
Fiat, Lancia and Ford
Risk index
20Low risk
Worst severity
Medium severityMain fault
Sensor failures: lambda sensor and crankshaft position sensor (TDC)4 documented faults · 0 serious
Recommended versions
- Rank 91.6 16v HR16DE / H4M
Nissan, Renault and Dacia
Risk index
20Low risk
Worst severity
Medium severityRecommended versions
- Rank 92.4 / 2.8 D-4D (GD)
Toyota
Risk index
20Low risk
Worst severity
Medium severityMain fault
Blocked particulate filter (DPF) due to incomplete regenerations4 documented faults · 0 serious
Recommended versions
- Rank 9BMW B38 / B37
BMW and MINI
Risk index
20Low risk
Worst severity
Critical severityMain fault
B38 crankshaft thrust bearing failure (units before April 2015)3 documented faults · 1 serious
- Rank 14Honda IMA híbrido
Honda
Risk index
21Low risk
Worst severity
High severityMain fault
High-voltage IMA battery degradation and IMA warning light on3 documented faults · 1 serious
- Rank 14e-Skyactiv D 3.3
Mazda
Risk index
21Low risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 16BMW B57
BMW
Risk index
22Low risk
Worst severity
High severity - Rank 171.0 / 1.25 MPi
Hyundai and Kia
Risk index
23Low risk
Worst severity
Medium severity - Rank 171.6 and 1.8 Ecotec 16v
Opel and Vauxhall
Risk index
23Low risk
Worst severity
Medium severity - Rank 171.6 DIG-T
Nissan
Risk index
23Low risk
Worst severity
Medium severityRecommended versions
None with a «Buy» verdict
- Rank 171.0 SCe (B4D)
Renault and Dacia
Risk index
23Low risk
Worst severity
Medium severityRecommended versions
None with a «Buy» verdict
- Rank 171.0 TSI / 1.5 TSI
Volkswagen, Seat, Cupra, Škoda and Audi
Risk index
23Low risk
Worst severity
Medium severity - Rank 171.2 Dualjet and 1.2 VVT
Suzuki
Risk index
23Low risk
Worst severity
Medium severity - Rank 172.0 / 2.4 i-VTEC
Honda
Risk index
23Low risk
Worst severity
High severityMain fault
Camshaft wear and pitting on the 2.0 K20 (Accord VII, CR-V II, Civic)2 documented faults · 1 serious
- Rank 172.0 MR20DE / 2.5 QR25DE
Nissan and Renault
Risk index
23Low risk
Worst severity
Critical severity - Rank 25BMW B48 / B38
BMW and MINI
Risk index
24Low risk
Worst severity
High severityMain fault
Deterioration of hoses and seals in the cooling circuit, with coolant loss4 documented faults · 1 serious
- Rank 25Mitsubishi PHEV
Mitsubishi
Risk index
24Low risk
Worst severity
High severityRecommended versions
- Rank 27
Risk index
25Moderate risk
Worst severity
Medium severityMain fault
Ti-VCT actuator or solenoid valve failure on the early units4 documented faults · 0 serious
- Rank 272.4 JTD / JTDm Multijet
Alfa Romeo, Lancia and Fiat
Risk index
25Moderate risk
Worst severity
Medium severityRecommended versions
- Rank 27Skyactiv-G
Mazda
Risk index
25Moderate risk
Worst severity
Medium severityRecommended versions
- Rank 272.0 16v F4R and F4RT
Renault
Risk index
25Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 272.3 MultiJet
Fiat and Iveco
Risk index
25Moderate risk
Worst severity
Critical severityMain fault
Camshaft breakage due to a manufacturing defect (Ducato, 2016-2017)6 documented faults · 2 serious
Recommended versions
None with a «Buy» verdict
- Rank 321.3, 1.5 and 1.6 gasolina (serie M)
Suzuki and Fiat
Risk index
27Moderate risk
Worst severity
Medium severityMain fault
Faulty catalytic converter and lambda sensors on the 2005-2010 Swift (engine warning light)4 documented faults · 0 serious
- Rank 33Smartstream 1.6 T-GDi
Hyundai and Kia
Risk index
29Moderate risk
Worst severity
High severityMain fault
Brake servo vacuum pump damaged on start-up (Tucson 1.6 T-GDi 48V and Sportage, 2022-2023)3 documented faults · 1 serious
- Rank 33M264/M254
Mercedes-Benz
Risk index
29Moderate risk
Worst severity
High severityMain fault
Poorly tightened 48 V earth wiring in the mild-hybrid system (fire risk)4 documented faults · 3 serious
Recommended versions
- Rank 331.6 e-XDi160
SsangYong and KGM
Risk index
29Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 361.4, 1.6 and 1.8 VVT-i
Toyota
Risk index
30Moderate risk
Worst severity
Medium severityRecommended versions
- Rank 371.2 Turbo
Toyota
Risk index
32Moderate risk
Worst severity
Medium severityRecommended versions
None with a «Buy» verdict
- Rank 372.0 and 2.4 VVT-i
Toyota
Risk index
32Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 37VM Motori 2.8 and 3.0 CRD
Jeep, Chrysler, Lancia, Dodge and Maserati
Risk index
32Moderate risk
Worst severity
High severityMain fault
Loss of the crankshaft signal that stalls the engine (Grand Cherokee 3.0 V6 CRD)4 documented faults · 1 serious
Recommended versions
None with a «Buy» verdict
- Rank 370.9 TwinAir and 1.0/1.3 FireFly
Fiat, Jeep, Lancia and Alfa Romeo
Risk index
32Moderate risk
Worst severity
High severity - Rank 371.8 T 20v
Volkswagen, Audi, Seat and Škoda
Risk index
32Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 37M112 / M113
Mercedes-Benz
Risk index
32Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 371.8 TCe
Alpine and Renault
Risk index
32Moderate risk
Worst severity
High severityMain fault
A110 oil pressure solenoid valve sticking in 2018–2019 cars2 documented faults · 2 serious
Recommended versions
- Rank 372.0 CRDi (D4EA)
Hyundai and Kia
Risk index
32Moderate risk
Worst severity
High severityMain fault
Wear and loss of performance of the variable-geometry turbo4 documented faults · 2 serious
Recommended versions
None with a «Buy» verdict
- Rank 37E-Tech Híbrido
Renault and Dacia
Risk index
32Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 372.3 dCi (M9T)
Renault, Opel and Nissan
Risk index
32Moderate risk
Worst severity
High severityRecommended versions
- Rank 372.2 TD4 / SD4
Land Rover and Jaguar
Risk index
32Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 482.0 FSI
Volkswagen, Audi, Seat and Škoda
Risk index
34Moderate risk
Worst severity
Medium severityRecommended versions
None with a «Buy» verdict
- Rank 48Honda e:HEV / i-MMD
Honda
Risk index
34Moderate risk
Worst severity
High severityRecommended versions
- Rank 501.0 VVT-i
Toyota, Citroën and Peugeot
Risk index
35Moderate risk
Worst severity
High severityRecommended versions
- Rank 511.6 CDTI
Opel, Vauxhall, Chevrolet and GMC
Risk index
36Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 511.1 and 1.4 CRDi
Hyundai and Kia
Risk index
36Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 511.2 16v
Renault and Dacia
Risk index
36Moderate risk
Worst severity
High severityRecommended versions
- Rank 511.4 and 1.6 TU3/TU5
Peugeot and Citroën
Risk index
36Moderate risk
Worst severity
High severity - Rank 511.0 T-GDI
Hyundai and Kia
Risk index
36Moderate risk
Worst severity
High severity - Rank 512.2 JTDm Multijet II
Alfa Romeo
Risk index
36Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 511.3 TCe
Renault, Dacia, Nissan and Mercedes-Benz
Risk index
36Moderate risk
Worst severity
High severity - Rank 51Audi 3.0 TFSI V6
Audi, Porsche and Volkswagen
Risk index
36Moderate risk
Worst severity
High severity - Rank 511.5 VC-Turbo e-Power
Nissan
Risk index
36Moderate risk
Worst severity
High severityMain fault
Safe mode due to battery controller calibration (loss of propulsion)4 documented faults · 3 serious
Recommended versions
None with a «Buy» verdict
- Rank 512.0 CDI (OM640)
Mercedes-Benz
Risk index
36Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 51Volvo 5 cilindros gasolina
Volvo and Ford
Risk index
36Moderate risk
Worst severity
Critical severity - Rank 511.7 CDTI
Opel, Vauxhall and Honda
Risk index
36Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 63M111
Mercedes-Benz
Risk index
38Moderate risk
Worst severity
Medium severityRecommended versions
None with a «Buy» verdict
- Rank 631.4 16v and 1.6 MPI/FSI
Volkswagen, Seat, Škoda and Audi
Risk index
38Moderate risk
Worst severity
High severity - Rank 63BMW B58
BMW and Toyota
Risk index
38Moderate risk
Worst severity
High severityRecommended versions
- Rank 632.0 and 2.2 CRDi
Hyundai and Kia
Risk index
38Moderate risk
Worst severity
High severityMain fault
High oil consumption from worn piston rings and valve guides (2.2 CRDi)3 documented faults · 2 serious
Recommended versions
- Rank 632.0 DTI and 2.2 DTI
Opel and Vauxhall
Risk index
38Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 631.4 TDI
Volkswagen, Seat, Škoda and Audi
Risk index
38Moderate risk
Worst severity
High severityRecommended versions
- Rank 631.7 CRDi
Hyundai and Kia
Risk index
38Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 632.0 / 2.4 GDI and T-GDI (Theta II)
Hyundai and Kia
Risk index
38Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 632.0 CDTI
Opel and Vauxhall
Risk index
38Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 72D5 5 cilindros
Volvo
Risk index
39Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 72OM656
Mercedes-Benz
Risk index
39Moderate risk
Worst severity
Critical severityRecommended versions
- Rank 74VW 2.0 TFSI EA113
Volkswagen, Audi, SEAT and Škoda
Risk index
41Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 741.0 TCe / SCe
Renault, Dacia and Nissan
Risk index
41Moderate risk
Worst severity
Critical severityRecommended versions
- Rank 74MZR gasolina
Mazda
Risk index
41Moderate risk
Worst severity
Critical severityMain fault
Big-end bearing damage in the 2.3 MZR, with isolated cases in the 1.8 and 2.04 documented faults · 1 serious
- Rank 77Drive-E gasolina
Volvo
Risk index
43Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 771.4 HDi
Peugeot, Citroën, Ford, Mazda and Toyota
Risk index
43Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 772.0 and 2.2 VCDi
Chevrolet
Risk index
43Moderate risk
Worst severity
Critical severityMain fault
Sump cover fire risk from DPF fault (2011–2015 Captiva diesel)3 documented faults · 1 serious
Recommended versions
None with a «Buy» verdict
- Rank 77M270/M274
Mercedes-Benz
Risk index
43Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 771.5 EcoBoost
Ford
Risk index
43Moderate risk
Worst severity
Critical severityMain fault
Coolant loss through a microcrack in the engine block (4-cylinder 1.5)2 documented faults · 2 serious
Recommended versions
None with a «Buy» verdict
- Rank 771.6 GDi híbrido (Kappa)
Hyundai and Kia
Risk index
43Moderate risk
Worst severity
Critical severityMain fault
Main relay of the power relay assembly (overheating and fire risk)2 documented faults · 2 serious
Recommended versions
- Rank 771.6 GDI / T-GDI
Hyundai and Kia
Risk index
43Moderate risk
Worst severity
Critical severityMain fault
Low-speed pre-ignition and connecting rod damage in the 1.6 T-GDI (documented in the US)3 documented faults · 2 serious
- Rank 772.2 / 2.4 / 3.2 TDCi (Puma)
Ford, Peugeot, Citroën and Land Rover
Risk index
43Moderate risk
Worst severity
Critical severityRecommended versions
- Rank 851.5 Hybrid
Toyota and Mazda
Risk index
44Moderate risk
Worst severity
Critical severityMain fault
Hybrid system shutdown without fail-safe mode (loss of drive)3 documented faults · 1 serious
Recommended versions
- Rank 861.4 and 1.6 16v
Renault and Dacia
Risk index
45Moderate risk
Worst severity
High severityRecommended versions
- Rank 862.0 BlueHDi
Peugeot, Citroën, DS and Opel
Risk index
45Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 861.2 TDI
Volkswagen, Seat and Škoda
Risk index
45Moderate risk
Worst severity
High severityMain fault
Manipulated emissions software (dieselgate) and the subsequent update5 documented faults · 2 serious
Recommended versions
None with a «Buy» verdict
- Rank 861.6 TDI
Volkswagen, Seat, Škoda and Audi
Risk index
45Moderate risk
Worst severity
High severityMain fault
Manipulated emissions software (dieselgate) and air flow stabiliser5 documented faults · 2 serious
Recommended versions
- Rank 861.4 Turbo
Opel and Vauxhall
Risk index
45Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 862.5 TDI R5
Volkswagen
Risk index
45Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 922.2 CDI (OM646)
Mercedes-Benz and Chrysler
Risk index
46Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 92Rover K-Series
Rover, MG, Land Rover and Lotus
Risk index
46Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 921.8/2.2 DI-D
Mitsubishi
Risk index
46Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 922.2 dCi and 3.0 dCi V6
Renault
Risk index
46Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 92TDV6 / SDV6
Land Rover, Jaguar, Peugeot and Citroën
Risk index
46Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 971.4 T-Jet
Fiat, Abarth, Alfa Romeo, Lancia and Jeep
Risk index
48Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 97
Risk index
48Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 97BMW N54/N55
BMW
Risk index
48Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 97
Risk index
48Moderate risk
Worst severity
High severity - Rank 971.6 dCi
Renault, Nissan, Opel, Fiat and Mercedes-Benz
Risk index
48Moderate risk
Worst severity
High severityRecommended versions
- Rank 971.4 D-4D
Toyota and MINI
Risk index
48Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 971.9 JTD/Multijet and 2.4 JTD
Fiat, Alfa Romeo, Opel, Saab and Suzuki
Risk index
48Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 972.2 HDi
Peugeot, Citroën, Ford and Land Rover
Risk index
48Moderate risk
Worst severity
High severityMain fault
DPF clogging with additive, especially on the 128-138 hp version4 documented faults · 3 serious
Recommended versions
- Rank 971.4 and 1.6 8v
Renault and Dacia
Risk index
48Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 971.8 TDCi
Ford
Risk index
48Moderate risk
Worst severity
Critical severityMain fault
Breakage of the timing belt or of the high-pressure pump's belt (running in oil)5 documented faults · 1 serious
Recommended versions
None with a «Buy» verdict
- Rank 972.0 TDI
Volkswagen, Seat, Škoda and Audi
Risk index
48Moderate risk
Worst severity
Critical severityRecommended versions
- Rank 1080.9 TCe
Renault, Dacia and Smart
Risk index
49Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1091.8 Hybrid
Toyota and Lexus
Risk index
50High risk
Worst severity
Critical severityRecommended versions
- Rank 1102.2 i-CTDi
Honda
Risk index
52High risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 1101.4/1.6 VTi
Peugeot, Citroën, DS and MINI
Risk index
52High risk
Worst severity
Critical severityMain fault
Fragile water pump (and expansion tank or heat exchanger, depending on displacement)3 documented faults · 2 serious
Recommended versions
None with a «Buy» verdict
- Rank 1101.6 and 2.0 MultiJet II
Fiat, Jeep and Alfa Romeo
Risk index
52High risk
Worst severity
Critical severityMain fault
Saturated diesel particulate filter (DPF) from incomplete regenerations5 documented faults · 2 serious
Recommended versions
None with a «Buy» verdict
- Rank 1102.0 dCi
Renault, Nissan and Opel
Risk index
52High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1102.2/2.5 dCi
Nissan
Risk index
52High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1103.0 TDI V6
Audi, Volkswagen and Porsche
Risk index
52High risk
Worst severity
Critical severity - Rank 116BMW M54
BMW
Risk index
54High risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 1161.33 Dual VVT-i
Toyota
Risk index
54High risk
Worst severity
Critical severityRecommended versions
- Rank 1161.2 TCe
Renault, Dacia, Nissan and Mercedes-Benz
Risk index
54High risk
Worst severity
Critical severityRecommended versions
- Rank 1162.0 TSI / TFSI
Volkswagen, Audi, Seat, Cupra and Škoda
Risk index
54High risk
Worst severity
Critical severity - Rank 1161.6 / 2.2 i-DTEC
Honda
Risk index
54High risk
Worst severity
Critical severityRecommended versions
- Rank 116
Risk index
54High risk
Worst severity
Critical severity - Rank 1222.0 HDi
Peugeot, Citroën, Ford, Volvo and Toyota
Risk index
55High risk
Worst severity
High severityMain fault
Variable-geometry turbo failures (actuator, sensors and clogging)5 documented faults · 2 serious
Recommended versions
- Rank 1221.0 / 1.5 VTEC Turbo
Honda
Risk index
55High risk
Worst severity
Critical severityRecommended versions
- Rank 122Skyactiv-D
Mazda
Risk index
55High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 122
Risk index
55High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 126BMW N13
BMW
Risk index
57High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 126M272/M273
Mercedes-Benz
Risk index
57High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1261.2 12V
Volkswagen, Seat and Škoda
Risk index
57High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 129BMW N43/N46
BMW
Risk index
59High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 129M271
Mercedes-Benz
Risk index
59High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1291.0/1.2/1.4 Ecotec
Opel and Vauxhall
Risk index
59High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1291.0 PureTech
Peugeot and Citroën
Risk index
59High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 129
Risk index
59High risk
Worst severity
Critical severityRecommended versions
- Rank 1291.6 EcoBoost
Ford and Volvo
Risk index
59High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1292.5 dCi YD25
Nissan
Risk index
59High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 129Subaru bóxer
Subaru
Risk index
59High risk
Worst severity
Critical severity - Rank 1372.0 and 2.5 Hybrid
Toyota and Lexus
Risk index
61High risk
Worst severity
Critical severityMain fault
Low-pressure fuel pump failure: loss of power and fire risk3 documented faults · 2 serious
- Rank 1382.3 MZR DISI Turbo
Mazda
Risk index
63High risk
Worst severity
Critical severityMain fault
Timing chain stretch and VVT actuator failure on the 2.3 DISI Turbo3 documented faults · 2 serious
Recommended versions
None with a «Buy» verdict
- Rank 138BMW M57
BMW, Land Rover and Opel
Risk index
63High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 138BMW N20
BMW
Risk index
63High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 138OM654
Mercedes-Benz
Risk index
63High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1381.5 dCi
Renault, Dacia, Nissan, Mercedes-Benz, Infiniti and Suzuki
Risk index
63High risk
Worst severity
Critical severity - Rank 1431.6 THP
Peugeot, Citroën, DS and MINI
Risk index
64High risk
Worst severity
Critical severityMain fault
Timing chain and tensioner stretch (turbo versions, before 2012)5 documented faults · 2 serious
Recommended versions
None with a «Buy» verdict
- Rank 143D4/D5
Volvo
Risk index
64High risk
Worst severity
Critical severityMain fault
Auxiliary belt breakage that takes the timing belt with it (5-cylinder)6 documented faults · 2 serious
Recommended versions
None with a «Buy» verdict
- Rank 143MZR-CD
Mazda
Risk index
64High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1431.3 Multijet
Fiat, Lancia, Alfa Romeo, Opel, Suzuki and Ford
Risk index
64High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1471.9 TDI
Volkswagen, Seat, Škoda and Audi
Risk index
66High risk
Worst severity
Critical severityRecommended versions
- Rank 1481.9 dCi
Renault, Nissan and Volvo
Risk index
67High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1491.6 CRDi
Hyundai and Kia
Risk index
70High risk
Worst severity
Critical severityMain fault
MHSG belt tensioner and crankshaft pulley failure (48V mild hybrid)6 documented faults · 4 serious
Recommended versions
- Rank 1501.6 HDi
Peugeot, Citroën, DS, Ford, Volvo, Mazda, MINI, Opel and Toyota
Risk index
71High risk
Worst severity
High severityMain fault
Turbo failure through lack of lubrication (carbon deposits and union filter)7 documented faults · 2 serious
Recommended versions
- Rank 1501.0 EcoBoost
Ford
Risk index
71High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 152OM642
Mercedes-Benz, Jeep, Chrysler, Dodge and Freightliner
Risk index
72High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 153BMW B47
BMW and MINI
Risk index
73High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1542.0/2.2 D-4D
Toyota and Lexus
Risk index
77Very high risk
Worst severity
Critical severityMain fault
Warped cylinder head gasket and oil consumption on the 2.2 D-4D4 documented faults · 1 serious
Recommended versions
None with a «Buy» verdict
- Rank 1541.5 BlueHDi
Peugeot, Citroën, DS, Opel, Toyota and Fiat
Risk index
77Very high risk
Worst severity
Critical severityRecommended versions
- Rank 156BMW M47
BMW, Rover and Land Rover
Risk index
79Very high risk
Worst severity
Critical severityRecommended versions
- Rank 1571.2 and 1.4 TSI
Volkswagen, Seat, Škoda and Audi
Risk index
84Very high risk
Worst severity
Critical severity - Rank 158BMW N57
BMW
Risk index
87Very high risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 158BMW N47
BMW and MINI
Risk index
87Very high risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1582.0 Ingenium diésel
Land Rover and Jaguar
Risk index
87Very high risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 161OM651
Mercedes-Benz and Infiniti
Risk index
89Very high risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 1621.2 PureTech
Peugeot, Citroën, DS, Opel, Fiat, Jeep, Alfa Romeo, Lancia and Toyota
Risk index
96Very high risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
3 engines awaiting more evidence
They have few documented faults, but that does not yet prove they are reliable: they have been on sale for less than 4 years (there has not yet been time for faults to appear) or we have studied them with fewer than 10 sources. They do count in the least reliable engine rankings.
The recommended versions are those with our verdict “Buy”: no known serious faults, or they have already been corrected, in this version. The reasoning behind each verdict, with its sources, is on the engine's page.
Gearboxes analysed
Gearboxes are rated with the same index, but listed separately: they do not compete with the engines.
- Rank 109G (Aisin)
Volkswagen, Audi, Seat and Škoda
Risk index
14Low risk
Worst severity
High severityMain fault
Total gearbox failure at low mileage, documented in an isolated case2 documented faults · 1 serious
Recommended versions
None with a «Buy» verdict
- Rank 2AL4 / DP0
Peugeot, Citroën and Renault
Risk index
25Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 3Dualogic
Fiat and Lancia
Risk index
29Moderate risk
Worst severity
High severityMain fault
Actuator or hydraulic pressure fault: the gearbox drops into neutral on its own or refuses gears2 documented faults · 1 serious
Recommended versions
None with a «Buy» verdict
- Rank 4DSG6 DQ250
Volkswagen, Seat, Škoda and Audi
Risk index
36Moderate risk
Worst severity
High severityMain fault
Mechatronic unit failure: solenoid valves and temperature sensor3 documented faults · 1 serious
Recommended versions
None with a «Buy» verdict
- Rank 4DSG7 DQ381/DQ500
Volkswagen, Seat and Škoda
Risk index
36Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 4ZF 8HP
BMW, Audi, Jaguar, Land Rover, Alfa Romeo and Jeep
Risk index
36Moderate risk
Worst severity
High severityMain fault
Mechatronic failure as the gearbox ages (sometimes with reverse)3 documented faults · 1 serious
Recommended versions
- Rank 47G-DCT
Mercedes-Benz
Risk index
36Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 8EAT6/EAT8
Peugeot, Citroën, DS and Opel
Risk index
38Moderate risk
Worst severity
High severityMain fault
Valve body failure leading to immobilisation or gearbox replacement3 documented faults · 1 serious
Recommended versions
None with a «Buy» verdict
- Rank 8CVT Xtronic
Nissan and Renault
Risk index
38Moderate risk
Worst severity
High severityMain fault
Oil leaks and internal wear that can force gearbox replacement3 documented faults · 2 serious
Recommended versions
None with a «Buy» verdict
- Rank 8EDC
Renault and Dacia
Risk index
38Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 117G-Tronic / 9G-Tronic
Mercedes-Benz
Risk index
44Moderate risk
Worst severity
High severityRecommended versions
None with a «Buy» verdict
- Rank 12ZF 6HP
BMW, Audi, Land Rover and Jaguar
Risk index
46Moderate risk
Worst severity
High severityMain fault
Valve body and mechatronic failure: erratic shifts or a locked-up gearbox3 documented faults · 1 serious
Recommended versions
None with a «Buy» verdict
- Rank 127DCT
Hyundai and Kia
Risk index
46Moderate risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 14DSG7 DQ200
Volkswagen, Seat, Škoda and Audi
Risk index
59High risk
Worst severity
High severityMain fault
Mechatronic unit failure: pressure accumulator, pump and cracked housing3 documented faults · 1 serious
Recommended versions
None with a «Buy» verdict
- Rank 15Multitronic
Audi and Seat
Risk index
64High risk
Worst severity
Critical severityRecommended versions
None with a «Buy» verdict
- Rank 16PowerShift
Ford
Risk index
72High risk
Worst severity
High severityMain fault
Juddering, hesitation and slipping of the dry clutch (DPS6)4 documented faults · 3 serious
Recommended versions
None with a «Buy» verdict
Torn between two of them? Compare two engines or see the least reliable engines.
How the risk index is calculated
- 1
Each documented fault receives a score: severity × frequency. Severity ranges from 1 (low) to 4 (critical) and frequency from 1 (rare) to 4 (very frequent). The maximum per fault is 16.
- 2
The three highest-scoring faults are taken. The first counts in full, the second counts half and the third a quarter. This way, an engine does not come out worse just because it has more minor faults documented.
- 3
The result is expressed from 0 to 100. A 100 would be three critical-severity faults that are very frequent.
- 0–24: low risk
- 25–49: moderate risk
- 50–74: high risk
- 75–100: very high risk
What it is not. It is not a statistic of faults per car sold, nor a prediction for a particular car: it summarises the faults documented in the sources we cite on each page. It only compares the engines we have analysed so far (162): an engine not appearing says nothing about its reliability.
Full methodology