BMW Z4 E85/E86 2.5si
2002–2008 · Coupe · Roadster · Sedan
Chassis codes: E85 · E86
Version
Engine
2.5L 6-cyl · Petrol
Power
218 HP
Torque
250 Nm
Transmission
MANUAL
Drive
RWD
0-100 km/h
6.5 sec
Top Speed
240 km/h
Fuel consumption
8.4 L/100km
Body
Roadster
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Model overview
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Engine overview · 2.5L 6-cyl PETROL
The BMW Z4 E85/E86 2.5-litre petrol group includes different naturally aspirated straight-six engines, so condition and service history matter more than the shared displacement label.
Pros
- Smooth naturally aspirated straight-six character.
- Good specialist knowledge and parts availability.
Cons
- M54 and N52 applications need different checks.
- Age-related cooling and oil-leak work may be due.
- Exact engine code should be confirmed by VIN.
Common problems & ownership concerns
Potential impact: Low · Medium · High. This describes possible consequences, not fault likelihood.
- M54 cooling-system ageing on earlier applicationsHigh
- Oil leaks from ageing seals and covers across the groupMedium
- M54 intake and VANOS wear on earlier applicationsMedium
- N52 valve-control and cooling-system components on later applicationsHigh
Maintenance
Follow the VIN-specific BMW schedule and oil specification, with particular attention to cooling-system, oil-leak and engine-family-specific service history.
These are general ownership concerns, not a diagnosis. Equipment and engine details vary by version and production date.
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