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Aluminum block & heads = no idling for warmup (archive)

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Posted by A time and a place on September 29, 1999 at 12:46:36:

In Reply to: So basically, warming up the car is not recommende posted by d?? - Arrwin on September 27, 1999 at 13:02:15:

: : : Why is it that BMW recommends that, after starting a cold engine, one should drive immediately and not let the car sit at an idle?

As a general rule, cars that have aluminum head(s)or aluminum block & head(s) should not be left idling to warm up. During warmup, there are parts of the engine/exhaust/drivetrain that will be considerably hotter than other parts. Driving the car (mildly) during this warmup period leads to a more even warmup at a faster rate than if the car were to be left sitting idling.

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