Common Problems with the
1985 BMW 6 Series (E63/E64)

Buying Tips for 1985 BMW 6 Series (E63/E64)

• On the 645Ci and 650i V8s, idle the car when warm for 5 minutes then blip the throttle; a puff of blue smoke means the valve stem seals are failing (a £2,000+ repair).
• Check the complex folding roof mechanism on the E64 convertible; ensure it opens fully without hesitation and that the rear window drops correctly.
• Listen for a 'ticking' noise from the V8 engines, which can indicate worn timing chain guides, another catastrophic failure point.
• Test the early iDrive system (CCC); random reboots or a frozen screen require a costly head unit rebuild.
• Inspect the gearbox for harsh shifting or a 'transmission fault' warning; the mechatronic sealing sleeve frequently leaks fluid.
• Verify the Dynamic Drive active anti-roll bars (if fitted) aren't leaking hydraulic fluid, as replacement valve blocks are very expensive.