2005 BMW 6 Series 645Ci M54B30 (E63)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Valve cover gasket leaks
• Cooling system component wear (water pump, thermostat)
• DISA valve failure causing rough idle

First checks

• Inspect cooling system for leaks and radiator condition
• Check VANOS operation for smoothness
• Verify condition of oil filter housing and seals

Before replacing parts

• Save fault codes and freeze-frame data before clearing anything.
• Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
• Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

• 645Ci is from BMW's 6 Series generation E63 introduced in 2004 model year, continuing through 2005
• Engine and power differ slightly by market emissions and tuning; North American power slightly detuned