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Unfortunately, the N54 has a few issues.. I've seen turbos fail a few times on them, problems with the wastegates. High pressure fuel pumps have problems. Thermostat and water pump problems (both are electric). Yeah, not BMW's shining example of a good motor, but that being said, it doesn't mean yours is bad. Keeping up the maintenance will help keep the problems to a minimum. Use a high quality synthetic oil for the engine, like Motul.
As for the 3M stuff, can't really help you out there... I'm sure someone else can help you with that.
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