2008 — 2010
4.8L (N62B48TU) - 650i Coupe/Convertible
Petrol
Check this by monitoring the exhaust upon start-up and acceleration. | Description: It's common for the N62 engine's valve stem seals to harden over time. Keep an eye out for blueish smoke from the tailpipes after idling at a traffic light, as this can indicate they may eventually need replacing.
While driving, pay close attention to the transmission shifts. | Description: The ZF 6-speed automatic is a great unit, but in older examples, it's worth noting if the shifts feel hesitant or clunky, which could suggest the mechatronics seal or fluid is due for attention.
Check this by inspecting the engine valley and undercarriage. | Description: Due to the heat generated by the 4.8L V8, the coolant transfer pipe is a known area of focus. It's sensible to look for any signs of seepage or historical cooling system repairs.
While parked, cycle through the iDrive menu and climate controls. | Description: Electronic gremlins can be quite common in these sophisticated tourers. Take a moment to ensure all seat adjustments, window regulators, and the iDrive controller respond promptly to input.
Usually the point where secondary cooling components like the thermostat and expansion tank may show signs of wear.
Consider having the suspension bushings and control arms inspected for any play, as these contribute to that classic BMW handling feel.
A common interval to review the status of the alternator bracket gasket and any potential oil leaks from the upper engine timing covers.
Prioritise oil changes every 7,500km to keep that V8 running smoothly.
Check the battery health regularly, as these cars are quite sensitive to voltage drops.
Keep the sunroof and convertible roof drains clear to prevent moisture ingress.
Regularly inspect the vacuum lines for any cracking due to engine bay heat.
Ensure the transmission fluid has been serviced or documented at least once in its life.
Estimated repair costs if issues arise
If the engine begins to burn oil, this is a significant job that involves removing the cylinder heads. It's a specialist task, so it is wise to keep a buffer in your long-term savings for this specific repair.
If you notice the temperature rising or small puddles forming, you might eventually need to budget for a comprehensive cooling system refresh to maintain the engine's longevity.
Depending on the driving history, you might eventually need to budget for a suspension refresh to restore that tight, responsive feeling back to factory standards.
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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