I like to change mine warm simply to speed up the oil drain time.
Valid arguments on both sides.
Cold engine, most of the oil has drained down to the pan but some of the settled sludge will stick to the bottom of the pan and not drain out.
Warm engine, the sludge is suspended in the oil better with less sticking to the pan, but oil is clinging to engine parts so one doesn't get a complete drain.
I guess the proper way would be to pull the plug on a warm engine and let it sit for several hours or over night.
Now let's remember there's residual oil in the oil pump, oil galley's and other areas of the engine that never drains out, on larger engines there's the oil cooler and any associated lines that oil will remain in, on my old 12 valve Cummins there's a half qrt that stays in the inj pump.
So no matter how one drains their oil there's alway some oil and sludge that remains behind.
The most important part is that new oil filter to catch some of that remaining sludge and future deposits.
An old mechanic I knew back in the 70's bought a new pickup, the standard oil change at that time was 3000 miles, he would go 2000 miles and change the filter, top off the oil and go again.
At 100,000 miles it had normal oil pressure, didn't use any more oil than any other engine of equal mileage and had never had the oil pug removed.
Claimed he had proven the point that as long as you filtered out the contaminates the oil never wore out, and the qrt of new oil at filter changes replenished the additives.
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