Your right, those "dirty gases" just came out of the combustion chamber. Thing is the gas that initially entered the chamber was clean air, and it didn"t become dirty until the combustion process filled it with the "dirt" created by the burning fuel. In older engines that "dirt" was expelled out the exhaust pipe, but they decided to clean up the exhaust gases by reinjection everything back into the cylinder for another burn. In doing that they are basically putting "dirt" that would have been expelled out the exhaust right back into the engine. Without the newer oils designed to handle the additional chemical complications created by injecting the "dirt" back into the engine, as well as those having the additional additives to handle the larger amount of "dirt" I can"t see the engines lasting nearly as long.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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