BMW B57 vs 1.9 D / dTi: which engine is more reliable?

According to our risk index, the BMW B57 carries less risk than the 1.9 D / dTi: 22/100 (low risk) versus 52/100 (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 1.9 D / dTi has 3 documented serious faults, the main one being «Damaged cylinder head and head gasket (naturally aspirated 1.9 D)».

Risk index

BMW B57

Low risk · 3 serious faults

Lower risk

Risk index

1.9 D / dTi

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

Reviewed on 2 November 202613 sources How 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 1.9 D / dTi reliable?

Renault's 1.9 D, 1.9 TD and 1.9 dTi diesels (F8Q, F8Qt and F9Q with an injection pump) have a reputation for longevity, but owner reviews repeat three weak points: the injection pump and cylinder head gasket on the naturally aspirated 1.9 D, and the auxiliary belt, EGR and turbo on the dTi. The common-rail 1.9 dCi is a different engine.^[3][4][5][6]

See the 7 of the 1.9 D / dTi faults

Side-by-side comparison

Comparison of BMW B57 and 1.9 D / dTi
Item	BMW B57	1.9 D / dTi
Technical data
Type	Engine	Engine
Fuel	Diesel	Diesel
Displacement	2,993 cm³	1,870 cm³
Timing	Chain	Timing belt (dry)
Power	265–400 hp	55–100 hp
Production	since 2015^[7][8]	1988–2006^[3][9][10]
Reliability
Risk index (what is it?)	22Low risk	52High risk
Documented faults	4	7
Of high or critical severity	3	3
Worst severity	High severity	Critical severity
Main faults	Medium severity: AdBlue/SCR system fault (NOx sensors, heater and pump) High severity: EGR cooler leaks on the B57 (limited action on the 540d xDrive) High severity: Timing chain wear on the gearbox side	High severity: Damaged cylinder head and head gasket (naturally aspirated 1.9 D) Critical severity: Brake servo vacuum pump: oil suction and loss of assistance High severity: Auxiliary and timing belt: breakage that can destroy the engine
Most expensive documented repair	No reliable data	No 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]	1.9 D 55/65 hp (F8Q, naturally aspirated indirect injection, 1988-2006)^{[4][5][6][11]} 1.9 TD/dT 90-95 hp (F8Qt, turbo with indirect injection, 1991-2001)^[3][6] 1.9 dTi 80-100 hp (F9Q with mechanical pump, direct injection and turbo, 1997-2002)^{[6][11][12][13]}
AvoidVersions to avoid	None	None

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

1.9 D / dTi

See the 11 models with the 1.9 D / dTi

Other comparisons

With the BMW B57

With the 1.9 D / dTi

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Sources

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

Motor BMW B57: fiabilidad y averíasDasercars · Motoring press · consulted 4 October 2026 · in Spanish
Motor BMW N57: diferencias con el B57Dasercars · Motoring press · consulted 4 October 2026 · in Spanish
Moteur F (Renault)Wikipédia (francés) · Other source · consulted 2 November 2026 · in French
Renault Clio IIWikipédia (francés) · Other source · consulted 2 November 2026 · in French
Fiabilité Renault Clio 2 : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
Fiabilité Renault Mégane 1 (1995-2002) : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
BMW B57 (Wikipedia en)Wikipedia · Other source · consulted 4 October 2026
BMW B57 (Wikipedia de)Wikipedia · Other source · consulted 4 October 2026 · in German
Renault F-Type engineWikipedia (inglés) · Other source · consulted 2 November 2026
Renault Clio IIWikipedia (alemán) · Other source · consulted 2 November 2026 · in German
Fiabilité Renault Kangoo (1997-2007) : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
Fiabilité Renault Scénic 1 (1996-2003) : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French
Fiabilité Renault Laguna 1 (1994-2001) : pannes et avis des propriétairesFiches-auto.fr · Motoring press · consulted 2 November 2026 · in French