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 - 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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