Last time I heard this theory it was applied to non-detergent oils and mostly for folks that drove Chevys that had straight sixes, cast iron pistons and splash lubrication. Your oil pick up is on the bottom of the pan, it pulls oil off the bottom, if "stuff" it settles out anytime you start the engine you'd sending a dose of crap to your main bearings, as others have mentioned detergent oils are designed to keep the contamination in suspension and oil filters designed to strain the contaminants out of the oil, theory being the contaminants are solid chunks bigger than the oil molecules so oil goes through the filter gunk doesn't. I prefer a hot drain, I think more oil runs out when it's hot, it runs out faster and I believe there's less sludge laying in pockets of a cold engine. But then again I'm just a reformed Dairy Farmer, so what the heck do I know?
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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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