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Old 10-15-2008, 01:30 PM
desertdriver desertdriver is offline
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Location: gilbert az
Join Date: Mar 2007
Posts: 1,512
Mein Auto: 335i sedan, sport paddles
the most critical apsect of warmup is the oil temp. this is because oil viscosity changes with oil temp. When the oil is cool, it does not lubricate your engine properly(its too thick), especially if you run it hard. BMW's use of the oil temp guidelines will help your car last longer by preventing you from running your engine hard under substandard lubrication conditions. With an engine that has such close tolerances(any finely engineered powerplant), the oil must come up to a sufficient temperature so it is not too thick to lubricate properly. Kudos to BMW for using a better way to help you take care of your car. If you ignore their recommendations, the risk is higher engine wear and shorter engine life. If you live in temps near freezing, it can take 20 mins or more to warm up your engine to the optimal operating temperature needed to run it hard if left out overnight.
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