Skip to content
MotorFiable
en

1.6 CRDi vs BMW M57: which engine is more reliable?

According to our risk index, the BMW M57 carries less risk than the 1.6 CRDi: 63/100 versus 70/100 (both 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 BMW M57 has 2 documented serious faults, the main one being «Broken intake swirl flaps».

Risk index

1.6 CRDi

70

High risk · 4 serious faults

Risk index

BMW M57

63

High 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

16 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 BMW M57 reliable?

The BMW M57 (1998-2010) is a six-cylinder diesel with a reputation for great mechanical longevity, capable of exceeding 500,000 km when well maintained, but a good share of the versions built before 2008 -especially with an automatic gearbox- have metal swirl flaps in the intake that can break and wreck the engine; check whether the car has them and what condition they are in before buying.[4][5][6]

See the 5 of the BMW M57 faults

Side-by-side comparison

Comparison of 1.6 CRDi and BMW M57
1.6 CRDiBMW M57
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement1,582 cm³—
TimingChainChain
Power90–136 hp150–286 hp
Productionsince 2009[1][7][8][9]1998–2010[4][10]
Reliability
Risk index (what is it?)70High risk63High 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: Broken intake swirl flaps
  2. High severity: Crankcase ventilation (PCV) valve failure
  3. Medium severity: Cracked exhaust manifold
Most expensive documented repairup to €1,800Particulate filter (DPF) blocked in urban usePublished figure[11]up to €300Faulty air flow meter on the BMW M57 (loss of power)Published figure[12]
Which versions to buy
BuyRecommended versions
  • Smartstream 1.6 CRDi U3 (D4FE, 115-136 hp, without mild hybrid, from 2018)[2][13]
None
With cautionVersions to be cautious about
  • 1.6 CRDi U2 (D4FB, 90-136 hp, sold in Spain from 2010 to ~2018)[1][14][15]
  • Smartstream 1.6 CRDi 48V mild hybrid (D4FE MHEV, 136 hp, from ~2019)[3][16]
  • M57D25, 2.5 litres (150-197 hp, 2000-2010 depending on application)[5]
  • M57D30, first-generation 3.0 litres (177-193 hp, 1998-2006 depending on application)[5]
  • M57D30TU, first revision 3.0 litres (201-272 hp, 2001-2006)[5]
  • M57D30TU2, second revision 3.0 litres, aluminium block (204-286 hp, 2004-2010)[5]
AvoidVersions to avoidNoneNone

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 16 models with the 1.6 CRDi

BMW M57

See the 10 models with the BMW M57

Other comparisons

With the 1.6 CRDi

With the BMW M57

Compare other engines

That is the comparison you are viewing: change one of the two engines.

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. BMW M57Wikipedia (inglés) · Other source · consulted 27 September 2026
  5. Motor BMW M57 - Reparación EspecializadaDasercars · Technical documentation · consulted 27 September 2026 · in Spanish
  6. BMW M57D30 engine specifications, problems and reliabilityBimmerPulse · Technical documentation · consulted 27 September 2026
  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. BMW M57Wikipedia (alemán) · Other source · consulted 27 September 2026 · in German
  11. Kia Ceed 1.6 Crdi Problemas | Fallos y averías más frecuentesTotalRenting · Other source · consulted 26 September 2026 · in Spanish
  12. Caudalímetro o sensor MAF: qué es, cómo funciona y cuáles son las averías más frecuentesDiariomotor · Motoring press · consulted 30 October 2026 · in Spanish
  13. Kia Ceed im TÜV-Check 2026: Schwachstellen, Mängel und ProblemeAUTO BILD · Motoring press · published 2026 · consulted 26 September 2026 · in German
  14. Kia and Hyundai 1.6 CRDI (D4FB) engineEngineDNA · Other source · consulted 26 September 2026
  15. Best Hyundai Kia 1.6 CRDI Mods & Upgrades Guide to D4FB TuningTorqueCars · Other source · consulted 26 September 2026
  16. KIA SPORTAGE 2023 - vehicle recallsGOV.UK (Driver and Vehicle Standards Agency) · Official body · consulted 26 September 2026