M54 vs M43 — Reliability Comparison

Specifications

M54

M43

Brand

BMW

Verdict

BEST

Reliability

86

89

Years

2000--2006

1993--2002

Displacement

2979 cc

1895 cc

Layout

I6

I4

Type

Petrol Na

Power

170--231 hp

102--118 hp

Known Issues

6

4

Total Risk Cost

€300--€700

€0--€0

Character

M54

"The last of the simple BMW straight-sixes: smooth, linear and very long-lived (around 330,000 km with proper care). Nothing on it is known to destroy the engine; the bills are age-related plastics and seals - crankcase ventilation, cooling system, DISA flap, VANOS seals and oil leaks."

M43

"BMW's simple 8-valve four-cylinder (1993-2002): M43B16 and M43B18 in the E36 316i/318i, E34 518i and Z3, and the M43TU 1.9 with balancer shafts in the E46 316i/318i and Z3 1.9. Iron block and a timing chain instead of the M40's belt. German guides call it robust, unlike the N42/N46 that replaced it. Typical age faults only: cooling-system plastics, oil leaks from the valve cover and front cover, noisy hydraulic lifters, the DISA intake valve and, on older cars, the air-flow meter."

Issues Comparison

M54 6

● MODERATE

Cooling system plastics — water pump, thermostat, expansion tank N/A--N/A 97,000 km--161,000 km

● MODERATE

DISA valve failure (intake manifold flap) N/A--N/A 113,000 km--161,000 km

● MODERATE

Double VANOS — solenoid and seal wear N/A--N/A N/A--N/A

● MODERATE

Crankcase ventilation (CCV) valve and hoses — oil consumption, false air €300--€700 120,000 km--N/A

○ MINOR

Oil leaks — valve cover, oil filter housing and oil pan gaskets N/A--N/A N/A--N/A

○ MINOR

Camshaft / crankshaft position sensor failure — stalling, rpm hunting N/A--N/A N/A--N/A

M43 4

● MODERATE

Cooling system plastic failures N/A--N/A N/A--N/A

○ MINOR

Oil leaks - valve cover, front cover gasket and crankcase vent valve N/A--N/A N/A--N/A

○ MINOR

Hydraulic lifter clatter N/A--N/A N/A--N/A

○ MINOR

DISA intake valve failure N/A--N/A N/A--N/A

Models

M54 13

5 Series E60 2003--2007 3 Series E46 2001--2005 5 Series E39 2000--2003 5 Series E60 2003--2005 3 Series E46 2001--2005 5 Series E39 2000--2003 Z4 E85 2003--2005 X5 E53 2000--2006 5 Series E60 2003--2005 Z4 E85 2003--2005 3 Series E46 2001--2005 5 Series E39 2000--2003 Z3 E36/7 2000--2002

M43 2

3 Series E36 1993--1999 3 Series E36 1993--1999