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Originally Posted by Samson
Warming up the oil before changing is typically a good idea - it'll be thinner, so more will come out and it will drain more quickly.
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Not why you pre-warm the oil.
You warm the oil and in doing so get all the gunk and particulates back in suspension so it will be drained out along with the oil.
This is really the purpose of the oil change because at regular service intervals, the oil still possesses most of it's lubricating properties - it's getting the dirt (really, there is dirt and fine particulates of sand that pass through the air filter), carbon, metal shavings, moisture and unburnt fuel out of the motor that the regular oil change is really all about!
Cheers!