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BMW B57 vs 1.5 D (TUD5): which engine is more reliable?

According to our risk index, the 1.5 D (TUD5) carries less risk than the BMW B57: 19/100 versus 22/100 (both low 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 1.5 D (TUD5) has no documented serious faults.

Risk index

BMW B57

22

Low risk · 3 serious faults

Risk index

1.5 D (TUD5)

19

Low risk · 0 serious faults

Lower risk

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

12 sourcesHow 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 1.5 D (TUD5) reliable?

A small indirect-injection diesel, slow but simple, with a good reputation for durability once its early problems are behind it. Its documented weak point is the cylinder head gasket, with oil leaks that PSA corrected in stages between 1995 and 1998; other issues (high idle, pump leaks, glow plug connector) are occasional.[3][4][5]

See the 3 of the 1.5 D (TUD5) faults

Side-by-side comparison

Comparison of BMW B57 and 1.5 D (TUD5)
BMW B571.5 D (TUD5)
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement2,993 cm³—
TimingChainTiming belt (dry)
Power265–400 hp50–58 hp
Productionsince 2015[6][7]1988–2004[8][9][10]
Reliability
Risk index (what is it?)22Low risk19Low risk
Documented faults43
Of high or critical severity30
Worst severityHigh severityMedium severity
Main faults
  1. Medium severity: AdBlue/SCR system fault (NOx sensors, heater and pump)
  2. High severity: EGR cooler leaks on the B57 (limited action on the 540d xDrive)
  3. High severity: Timing chain wear on the gearbox side
  1. Medium severity: Oil leaks from the cylinder head gasket and crankshaft seal
  2. Medium severity: Injection pump: high idle and leaks
  3. Low severity: Glow plug faults: corroded connector and glow plugs
Most expensive documented repairNo reliable dataNo 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]
  • 1.4 D 50 hp (TUD3Y, 1993-1994 on the 106)[3][5]
  • 1.5 D 54-58 hp (TUD5: VJZ, VJY and VJX, 1994-2003)[3][11][12]
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

BMW B57

See the 9 models with the BMW B57

1.5 D (TUD5)

Other comparisons

With the BMW B57

With the 1.5 D (TUD5)

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 BMW B57: fiabilidad y averíasDasercars · Motoring press · consulted 4 October 2026 · in Spanish
  2. Motor BMW N57: diferencias con el B57Dasercars · Motoring press · consulted 4 October 2026 · in Spanish
  3. Peugeot 106: fiche fiabilitéCaradisiac · Motoring press · consulted 2 November 2026 · in French
  4. Citroën Saxo: fiche fiabilitéCaradisiac · Motoring press · consulted 2 November 2026 · in French
  5. Quelle citadine d'occasion choisir ?L'argus · Motoring press · consulted 2 November 2026 · in French
  6. BMW B57 (Wikipedia en)Wikipedia · Other source · consulted 4 October 2026
  7. BMW B57 (Wikipedia de)Wikipedia · Other source · consulted 4 October 2026 · in German
  8. PSA TUD engineWikipedia (en) · Other source · consulted 2 November 2026
  9. Peugeot 106Wikipedia (de) · Other source · consulted 2 November 2026 · in German
  10. Peugeot 106 1.5 D 58 ch: fiabilité du moteurFiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French
  11. Fiabilité Peugeot 106: pannes et avis des propriétairesFiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French
  12. Fiabilité Citroën Saxo: pannes et avis des propriétairesFiches-auto.fr · Owners' forum · consulted 2 November 2026 · in French