2004 — 2005
4.4L (N62B44) V8 - 645Ci Convertible
Petrol
Check the convertible roof operation by initiating a full open and close cycle while parked on flat ground; ensure there are no hesitation points or unusual grinding noises. | Note: The hydraulic pump and roof sensors in the E64 can become temperamental as they age.
While idling at a warm engine temperature, observe the exhaust for any blue-tinted smoke, which may indicate aging valve stem seals. | Note: The N62 V8 engine is known to develop oil consumption habits over time due to these seals hardening.
Check this by performing a 'cold start' if possible; listen closely for any rattling sounds from the engine bay or Vanos unit that might settle once the engine warms up. | Note: Smooth idle and consistent power delivery are key indicators of a well-maintained N62 power plant.
Look for signs of dampness in the boot area, specifically around the battery compartment and spare tyre well. | Note: Drain blockages in the convertible top storage compartment can occasionally allow water ingress into sensitive electrical modules located in the boot.
Cooling system overhaul including water pump, thermostat, and plastic coolant pipes.
Suspension bushing and control arm refreshment for maintaining that classic BMW driving feel.
Full inspection of the alternator bracket gasket and valve cover gaskets to manage typical seepage points.
Prioritise an engine oil change every 10,000km using high-quality synthetic oil to protect the V8 internals.
Inspect the coolant reservoir and hoses regularly, as plastic components become brittle with NZ sun exposure.
Keep the battery on a trickle charger if the vehicle is used sparingly, as the complex electronics are sensitive to low voltage.
Ensure the drainage channels for the soft top are kept free of debris to prevent internal moisture issues.
Check the transmission fluid and mechatronics seal, as proactive servicing can improve shifting smoothness over time.
Estimated repair costs if issues arise
If this component needs attention in the future, it involves significant engine work to replace the seals to stop oil burning. It is worth monitoring oil consumption as part of your Future Budget Planning.
Depending on the car's history, you might eventually need to budget for replacing plastic coolant pipes and the expansion tank to ensure the V8 runs at optimal temperatures.
This is a common maintenance item for the N62 engine. If you notice a minor oil leak near the front of the engine, it is often this gasket requiring professional attention.
Noticed something inaccurate or missing?Suggest an edit→
Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer