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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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