Quote:
Originally Posted by RealStig
You should never idle these cars (Ms in general, but 8 cylinders running in tight compressions) in cold weather just to warm the engine up. It's extremely bad for the longevity of the engine because of the way synthetic oil can get into places that is not meant to be. The M3 forum has had extensive discussion regarding this and the outcome every time was, "drive the car regardless of how cold the weather is and never warm it up on idle for several minutes". The rule of thumb is, I turn the ignition on, wait for RPMs to drop from 1200 to 800 (which takes about 5-6 seconds) and I drive. I shift below 3500 rpm, which helps getting oil temperature up there.
With the M3s which uses a different oil all together (10w-60) which is basically a very thick oil, this is even more important. M5 uses the standard 05w-30, but I'd still not idle warm the car for more than 10-15 seconds unless I have to.
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TOTALLY CORRECT never idle these engines, get in start and GO.
Mine takes 7/9 miles of 75MPH driving from stone cold, it never varies with temperature outside, always the same distance.
I do live next to the duel carriageway.