Quote:
Originally Posted by alexiskai
Adding an oil filter to the engine can do a lot of what an air filter would do.
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Except it filters out (maybe) the dust AFTER that dust has gone through the cylinder and down past the rings into the oil. Further, the dust particles that get past the rings are extremely small, too small to be filtered out. If I remember, most filters only catch dirt particles 10 microns and larger. The dust that gets by the rings is smaller than that.