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Water pump
Thermostat
Coolant reservoir
Plastic tube that feeds the coolant reservoir
Oil filter housing gasket
Oil cooler housing gasket
Genuine BMW coolant
Start with the gaskets as they are the cheapest but also known to fail the most
Then move on to the water pump and thermostat
Then the rest
If the car has non genuine fluids it take a lot of water to flush them old fluid out.
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