BMW B57 vs 2.0 CDTI: which engine is more reliable?

According to our risk index, the BMW B57 carries less risk than the 2.0 CDTI: 22/100 (low risk) versus 38/100 (moderate risk). The BMW B57 has 3 documented serious faults, the main one being «EGR cooler leaks on the B57 (limited action on the 540d xDrive)»; the 2.0 CDTI has 2 documented serious faults, the main one being «Turbocharger wear or failure».

Risk index

BMW B57

Low risk · 3 serious faults

Lower risk

Risk index

2.0 CDTI

Moderate risk · 2 serious faults

The index (0–100) weights the severity and frequency of the three most serious documented faults. How it is calculated

Reviewed on 4 October 202612 sources How we work

Is the BMW B57 reliable?

The BMW B57 (2015 onwards) is the six-cylinder diesel that succeeded the N57. The sources consulted document no widespread faults: its most cited weak point is the AdBlue/SCR system, and it was left out of the big EGR campaigns that hit the N47 and N57. The timing chain is still at the back, next to the gearbox.^[1][2]

See the 4 of the BMW B57 faults

Is the 2.0 CDTI reliable?

Unlike the 1.3 and 1.6 CDTI of the same era, the Opel/Vauxhall 2.0 CDTI (2008-2019, 110-210 hp with BiTurbo variants) is an engine with a timing belt rather than a chain. It builds up soot in the injectors and EGR valve, clogs its DPF on short journeys, has a recorded faulty turbo and one engine failure, and its models were among those investigated by Germany's KBA and the Frankfurt public prosecutor over a possible switching-off of the emissions treatment.^{[3][4][5][6][7][8]}

See the 6 of the 2.0 CDTI faults

Side-by-side comparison

Comparison of BMW B57 and 2.0 CDTI
Item	BMW B57	2.0 CDTI
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	2,993 cm³	1,956 cm³
Timing	Chain	Timing belt (dry)
Power	265–400 hp	110–210 hp
Production	since 2015^[9][10]	2008–2019^[3][11]
Reliability
Risk index (what is it?)	22Low risk	38Moderate risk
Documented faults	4	6
Of high or critical severity	3	2
Worst severity	High severity	Critical severity
Main faults	Medium severity: AdBlue/SCR system fault (NOx sensors, heater and pump) High severity: EGR cooler leaks on the B57 (limited action on the 540d xDrive) High severity: Timing chain wear on the gearbox side	High severity: Turbocharger wear or failure Medium severity: Soot build-up in the injectors and EGR valve Medium severity: Clogged particulate filter (DPF) and oil dilution on short journeys
Most expensive documented repair	No reliable data	No reliable data
Which versions to buy
BuyRecommended versions	B57D30 265 hp, single turbo (B57D30O0, 2015-2020)^[1] B57D30 286-340 hp, twin turbo with 48 V (B57D30O2/T2, 2020 onwards)^[1]	None
With cautionVersions to be cautious about	B57D30 320 hp, twin turbo (B57D30T0, 2015-2020)^[1] B57D30 400 hp, four turbos (B57D30S0, 2016-2020)^[1]	2.0 CDTI 110-131 hp (A20DTH/A20DTJ, 2008-2015)^[4][12] 2.0 CDTI 160-170 hp (A20DTH/A20DTJ/B20DTH, 2008-2019)^[5][6] 2.0 BiTurbo CDTI 195 hp (A20DTR, 2011-2015)^[4] 2.0 CDTI BiTurbo 210 hp 4x4 (Insignia B, 2017-2022)^[11]
AvoidVersions to avoid	None	None

Severity of each fault: green, low; amber, medium; red, high; dark red, critical. How we rate them

Cars that each one is fitted to

BMW B57

See the 9 models with the BMW B57

2.0 CDTI

Other comparisons

With the BMW B57

With the 2.0 CDTI

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Sources

Every fact on this page links to its source. If you find an error, let us know.

Motor BMW B57: fiabilidad y averíasDasercars · Motoring press · consulted 4 October 2026 · in Spanish
Motor BMW N57: diferencias con el B57Dasercars · Motoring press · consulted 4 October 2026 · in Spanish
Opel Insignia AWikipedia (alemán) · Other source · consulted 27 September 2026 · in German
Opel Astra (H, J, K): Technische Daten, Abmessungen, AnhängelastGebrauchtwagenberater.de · Technical documentation · consulted 27 September 2026 · in German
Fiabilité Opel Insignia - avis et pannes des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
Fiabilité Opel Insignia Grand Sport - avis et pannes des propriétairesFiches-auto.fr · Owners' forum · consulted 27 September 2026 · in French
Opel está de nuevo en el punto de mira por las emisiones con 60.000 coches afectadosMotorpasión · Motoring press · published 16 July 2018 · consulted 27 September 2026 · in Spanish
La Fiscalía alemana registra las instalaciones de Opel en el marco de una investigación sobre emisionesMotorpasión · Motoring press · published 15 October 2018 · consulted 27 September 2026 · in Spanish
BMW B57 (Wikipedia en)Wikipedia · Other source · consulted 4 October 2026
BMW B57 (Wikipedia de)Wikipedia · Other source · consulted 4 October 2026 · in German
Opel InsigniaWikipedia (inglés) · Other source · consulted 27 September 2026
Opel Insignia A – Typische Probleme & KrankheitenGebrauchtwagenberater.de · Other source · consulted 27 September 2026 · in German