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Originally Posted by Xotik H3
That black soot is called exhaust. It has nothing to do with external dirt, that soot is Hydrocarbons as a by product of combustion.  |
The point is that there are other sources of dirt in the engine - my first sentence.
What color is the oil when you change it? Where do you think this contamination comes from? Don't you think these suspended particles get pumped around the engine?
GM found that if you use company XXX's fuel you can go longer before oil changes because thier fuel burns cleaner and doens't contaminate the oil as much.