I don't think it makes much difference. I do mine cold mainly to most of the oil out. If its been sitting over night or longer most of the oil is in the pan. A GOOD oil will trap the contaminates and suspend them in the oil anyway. the filter will take out the particulates. (always change the filter)
If you had the engine running the oil will take some time to drain back down to the pan and therefore, if you're in a hurry you won't get all the old oil and contaminates that are spread throughout the engine out anyway.
Now if its an old engine that's seen a hard dusty life like alot of farm trucks and tractors it probably has some sludge and varnish. if you're worried about it flush it with a good engine flush and follow directions. using a premium synthetic will clean an engine out too but you may have to change a filter or 2 as the contaminates the syn oil cleans up will plug the filters (had that happen 2x now on used cars i switched to Synthetic AMSOIL).
i'd keep changing it cold and always change the filter
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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