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BMW B57 vs 2.3 dCi (M9T): which engine is more reliable?

According to our risk index, the BMW B57 carries less risk than the 2.3 dCi (M9T): 22/100 (low risk) versus 32/100 (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 2.3 dCi (M9T) has 2 documented serious faults, the main one being «Clogged or broken EGR valve damaging the turbo».

Risk index

BMW B57

22

Low risk · 3 serious faults

Lower risk

Risk index

2.3 dCi (M9T)

32

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

9 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 2.3 dCi (M9T) reliable?

The 2.3 dCi M9T is a van diesel with good durability if maintenance is kept up. The weak points cited are the EGR and the turbo, the injectors, and the particulate filter in urban use; the sources are mostly opinion websites.[3][4]

See the 5 of the 2.3 dCi (M9T) faults

Side-by-side comparison

Comparison of BMW B57 and 2.3 dCi (M9T)
BMW B572.3 dCi (M9T)
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement2,993 cm³2,300 cm³
TimingChainChain
Power265–400 hp100–180 hp
Productionsince 2015[5][6]since 2010[3][4][7]
Reliability
Risk index (what is it?)22Low risk32Moderate risk
Documented faults45
Of high or critical severity32
Worst severityHigh severityHigh 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. High severity: Clogged or broken EGR valve damaging the turbo
  2. Medium severity: Faulty injectors on the 2.3 dCi
  3. Medium severity: Diesel particulate filter (DPF) clogged in urban use
Most expensive documented repairNo reliable dataup to €2,300Clogged or broken EGR valve damaging the turboPublished figure[3][8]
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]
  • 2.3 dCi 100-125 hp (M9T)[4]
  • 2.3 dCi 130-145 hp (M9T)[4]
With cautionVersions to be cautious about
  • B57D30 320 hp, twin turbo (B57D30T0, 2015-2020)[1]
  • B57D30 400 hp, four turbos (B57D30S0, 2016-2020)[1]
  • 2.3 dCi 150-180 hp (M9T, some twin-turbo)[4]
  • 2.3 dCi in the Navara D23 (NP300)[9]
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 8 models with the BMW B57

2.3 dCi (M9T)

Other comparisons

With the BMW B57

With the 2.3 dCi (M9T)

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. Renault Master III 2.3 dCi 130: fiabilité, pannes et coûtsCarverif · Other source · consulted 5 October 2026 · in French
  4. Fiabilité Renault Master 2.3 dCiCarverif · Other source · consulted 5 October 2026 · in French
  5. BMW B57 (Wikipedia en)Wikipedia · Other source · consulted 4 October 2026
  6. BMW B57 (Wikipedia de)Wikipedia · Other source · consulted 4 October 2026 · in German
  7. Renault Master (tercera generación)Wikipedia · Other source · consulted 5 October 2026
  8. Fiabilité du Renault Master RT 2.3 dCi: analyse complèteCarverif · Other source · consulted 5 October 2026 · in French
  9. Nissan Navara wymaga zmian systemu oczyszczania spalinAutokatalog.pl · Motoring press · published 23 August 2023 · consulted 5 October 2026 · in another language