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There is absolutely no reason to warm the car up before changing the oil. If you recall, the last time that you shut the car off it was warmed up, so all the oil already drained down into the sump.
By warming the car up your circulating oil through the engine. When you go to drain it, though it may run more freely, it has to drain out of the entire engine again. Warming the car up is completely unnecessary.
I don't see any benefits.
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