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Hi,
You definitely want it warm. This will allow the oil to flow easier insuring that you get it all out. It also will take any accumulated dirt, sludge, etc. and get it in suspension, so the oil can carry it out. BTW, it's best to change the oil prior to storing the car for the season so you don't have all that accumulated moisture, fuel, and acidic compounds raising havoc with the internals while the car is stored. Ideally, you want to change the oil the day you store the car and allow it to run no more than 10 min. to circulate it fully and then shut it down for the season. Hope this helps...
Happy Motoring!... Jim'99
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