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MotorFiable

1.6 CRDi vs 2.5 TDI R5: which engine is more reliable?

According to our risk index, the 2.5 TDI R5 carries less risk than the 1.6 CRDi: 45/100 (moderate risk) versus 70/100 (high risk). The 1.6 CRDi has 4 documented serious faults, the main one being «MHSG belt tensioner and crankshaft pulley failure (48V mild hybrid)»; the 2.5 TDI R5 has 2 documented serious faults, the main one being «Plasma coating flaking off the cylinders».

Risk index

1.6 CRDi

70

High risk · 4 serious faults

Risk index

2.5 TDI R5

45

Moderate risk · 2 serious faults

Lower risk

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

17 sourcesHow we work

Is the 1.6 CRDi reliable?

The U2 D4FB (2009-2018) is a generally robust diesel if well maintained, with known turbo failures in the early units and timing chain problems from 120,000-150,000 km. Its successor, the Smartstream (U3 D4FE, from 2018), has a good reputation, except in the 48V mild hybrid version, which has a belt tensioner and crankshaft pulley fault that can destroy the engine.[1][2][3]

See the 6 of the 1.6 CRDi faults

Is the 2.5 TDI R5 reliable?

The 2.5 TDI R5 in the T5 and the Touareg has a poor reputation: camshaft wear, pump injectors and cylinder coating. The later series were more reliable. It is not Audi's V6 TDI.[4][5][6]

See the 5 of the 2.5 TDI R5 faults

Side-by-side comparison

Comparison of 1.6 CRDi and 2.5 TDI R5
1.6 CRDi2.5 TDI R5
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement1,582 cm³2,461 cm³
TimingChainTiming belt (dry)
Power90–136 hp88–174 hp
Productionsince 2009[1][7][8][9]2003–2011[10][11][12]
Reliability
Risk index (what is it?)70High risk45Moderate risk
Documented faults65
Of high or critical severity42
Worst severityCritical severityCritical severity
Main faults
  1. Critical severity: MHSG belt tensioner and crankshaft pulley failure (48V mild hybrid)
  2. Critical severity: Timing chain stretch
  3. High severity: Premature variable-geometry turbo (VGT) failure
  1. Critical severity: Plasma coating flaking off the cylinders
  2. High severity: Camshaft and hydraulic tappet wear
  3. Medium severity: Leaks and play in the unit injectors
Most expensive documented repairup to €1,800Particulate filter (DPF) blocked in urban usePublished figure[13]No reliable data
Which versions to buy
BuyRecommended versions
  • Smartstream 1.6 CRDi U3 (D4FE, 115-136 hp, without mild hybrid, from 2018)[2][14]
None
With cautionVersions to be cautious about
  • 1.6 CRDi U2 (D4FB, 90-136 hp, sold in Spain from 2010 to ~2018)[1][15][16]
  • Smartstream 1.6 CRDi 48V mild hybrid (D4FE MHEV, 136 hp, from ~2019)[3][17]
  • 2.5 TDI 130 and 174 hp with DPF (BNZ, BPC, 2006-2009)[4]
  • 2.5 TDI common rail Crafter (88 to 163 hp, 2006-2011)[12]
AvoidVersions to avoidNone
  • 2.5 TDI 130 and 174 hp (AXD, AXE, 2003-2006)[4]

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

Cars that each one is fitted to

1.6 CRDi

See the 17 models with the 1.6 CRDi

2.5 TDI R5

Other comparisons

With the 1.6 CRDi

With the 2.5 TDI R5

Compare other engines

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Sources

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

  1. Motor Kia y Hyundai 1.6 CRDI (D4FB): ficha tecnica, problemas y tuningMotordinámico · Technical documentation · consulted 26 September 2026 · in Spanish
  2. Kia Ceed III: Bekannte Probleme & RückrufeGebrauchtwagenberater · Other source · consulted 26 September 2026 · in German
  3. Kia / Hyundai 1.6 CRDi MHEV Engine FailuresDOHC (especialista en reconstrucción de motores) · Technical documentation · consulted 26 September 2026
  4. VW T5 4Motion Gebrauchtwagen-TestAuto Bild · Motoring press · consulted 5 October 2026 · in German
  5. Kaufberatung gebrauchter VW T5 (2003-2015)Promobil · Motoring press · consulted 5 October 2026 · in German
  6. Ratgeber Technik: Fehler VW T5Auto Bild · Motoring press · consulted 5 October 2026 · in German
  7. Hyundai U engineWikipedia · Other source · consulted 26 September 2026
  8. Hyundai Smartstream engineWikipedia · Other source · consulted 26 September 2026
  9. Hyundai i30 Kombi 1.6 CRDi 48V-Mildhybrid Trend (10/20-01/22): Technische Daten, Bilder, PreiseADAC · Technical documentation · consulted 26 September 2026 · in German
  10. VW T5Wikipedia (de) · Other source · consulted 5 October 2026 · in German
  11. VW Touareg IWikipedia (de) · Other source · consulted 5 October 2026 · in German
  12. Volkswagen CrafterWikipedia (es) · Other source · consulted 5 October 2026 · in Spanish
  13. Kia Ceed 1.6 Crdi Problemas | Fallos y averías más frecuentesTotalRenting · Other source · consulted 26 September 2026 · in Spanish
  14. Kia Ceed im TÜV-Check 2026: Schwachstellen, Mängel und ProblemeAUTO BILD · Motoring press · published 2026 · consulted 26 September 2026 · in German
  15. Kia and Hyundai 1.6 CRDI (D4FB) engineEngineDNA · Other source · consulted 26 September 2026
  16. Best Hyundai Kia 1.6 CRDI Mods & Upgrades Guide to D4FB TuningTorqueCars · Other source · consulted 26 September 2026
  17. KIA SPORTAGE 2023 - vehicle recallsGOV.UK (Driver and Vehicle Standards Agency) · Official body · consulted 26 September 2026