Detergent and non-detergent oils do not do the same thing in an engine. The benefits of detergents in gasoline engines have been shown by repeated tests under arduous conditions for close to a century. No benefit is gained by using non-detergent oil except in special circumstances like air compressors and some hydraulic systems. My local auto parts store sells quarts of non-detergent oil at the same price as detergent oil, so no money is saved by skipping the detergent. If anything, detergent oil can be easily purchased in bulk at a discount--actually saving money. Engines using non-detergent oils also require more frequent oil changes--driving costs up further.
The sludge build-up in Mopars (usually Dodge Intrepids, but also others) was caused by poor crankcase ventilation and other design problems. It ultimately went to arbitration, and Chrysler ended up paying restitution. Had non-detergent oil been used in the same engines, the problems would have been even worse.
I've posted a link to a technical description of the various additives and what they do in modern oils.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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