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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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