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 - The Tractor Parade: Story of a Case SC - by Bernie DeLon. On a early fall morning back in 1994, I opened the newspaper and happened to spy an article about a local antique tractor club having their annual show that weekend.
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