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The recommended type of coolant for a 2006 BMW 530d is Glysantin G48. You can use other coolants in an emergency, but don't leave them in your car long term.
The 2006 BMW 3-Series has double overhead cam (DOHC).
The 2006 BMW 7-Series has double overhead cam (DOHC).
The 2006 BMW 6-Series has double overhead cam (DOHC).
The 2006 BMW 5-Series has double overhead cam (DOHC).
Water
Use only BMW recommended coolant.
The 2006 BMW 7-Series has a V8 engine.
The 2006 BMW 5-Series has 24 valves.
The 2006 BMW 7-Series has 32 valves.
The 2006 BMW 6-Series has a V8 engine.
The 2006 BMW 3-Series has 24 valves.