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BMW B57 vs 2.5 dCi YD25: which engine is more reliable?

According to our risk index, the BMW B57 carries less risk than the 2.5 dCi YD25: 22/100 (low risk) versus 59/100 (high 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 2.5 dCi YD25 has 3 documented serious faults, the main one being «Timing chain wear and failure».

Risk index

BMW B57

22

Low risk · 3 serious faults

Lower risk

Risk index

2.5 dCi YD25

59

High risk · 3 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 2.5 dCi YD25 reliable?

The 2.5 dCi YD25 in the Navara D40 and Pathfinder R51 is tough, but it has one documented weak point: the lower timing chain, whose failure can destroy the engine. Check its condition, as well as the EGR and the turbo.[3][4][5]

See the 4 of the 2.5 dCi YD25 faults

Side-by-side comparison

Comparison of BMW B57 and 2.5 dCi YD25
BMW B572.5 dCi YD25
Technical data
TypeEngineEngine
FuelDieselDiesel
Displacement2,993 cm³2,488 cm³
TimingChainChain
Power265–400 hp144–190 hp
Productionsince 2015[6][7]2005–2015[3][8][9]
Reliability
Risk index (what is it?)22Low risk59High risk
Documented faults44
Of high or critical severity33
Worst severityHigh severityCritical 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. Critical severity: Timing chain wear and failure
  2. High severity: Turbocharger failure
  3. Medium severity: EGR valve clogged with carbon
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]
  • 2.5 dCi 144 and 174 hp (YD25DDTi, 2005-2010)[3][4]
  • 2.5 dCi 190 hp (YD25DDTi, 2010-2015)[3][4]
  • 2.5 YD25DDTi 133 hp (Navara D22 / NP300, from 2001)[3][4]
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

2.5 dCi YD25

Other comparisons

With the BMW B57

With the 2.5 dCi YD25

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. Tips for buying a second-hand pickup: Nissan NavaraFarmers Weekly Interactive · Motoring press · consulted 5 October 2026
  4. YD25 Engine Guide: Specs, Reliability, Problems & Buying TipsAutopartswd · Technical documentation · consulted 5 October 2026
  5. Nissan Navara ProblemeCarwiki.de · Other source · consulted 5 October 2026 · in German
  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. Nissan YD engineWikipedia · Other source · consulted 5 October 2026
  9. Nissan NavaraWikipedia · Other source · consulted 5 October 2026