The N62 V8 in the E63 645ci is known for problems but most are manageable:
If you buy one with these already fixed, its actually a reliable car. The V8 sound is incredible and the car looks timeless.
Anyone else daily driving an E63?
The N62 is a great engine when maintained but has some well-known issues. The valve stem seals are the biggest one - they harden and cause oil burning, especially on cold start. Replacement is about 2000-3000 EUR. The Valvetronic motor and eccentric shaft sensor also fail. Coolant transfer pipe behind the intake manifold is another common leak point. Budget 1000-1500 EUR per year for maintenance on these.
Had an E63 650i for 3 years. Beautiful car but the N62 ate my wallet. Valve stem seals at 120k km, alternator bracket leak, and the Valvetronic motor died twice. If you buy one, get a pre-purchase inspection from a BMW specialist. Check for blue smoke on startup - thats the valve seals.
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