Quote:
Originally Posted by w3rkn
BMW break-in:
Start the car and let it idle at least 5m before driving, then.. when it is @ operating temp.. it is yours do what u want.
Very simple!
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Just about the worst idea, as undue idling is hard on a car, five minutes of idling is almost certainly not enough time to heat the oil and this will also do nothing for transmission temps.
Just ignoring break in protocol, the best way to warm up a car is to actually drive it. That way the transmission also warms up with the motor. Ideally, you'd rely on an engine oil temperature gauge, not a coolant gauge to determine when it's safe to bring the revs up. This is what recent M cars indicate with the variable redline. Most BMW manuals give you guidelines of what the oil temp should be at before exceeding 4k rpm and redlining.