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Not seeing lead deposits on valves for perhaps 20 years, the faces I have seen black as well as the not moving through guide portions of the stems. The black coating is rather thin.
Egr systems tend to get gummed up with short duration trips which would be a bigger problem as with not cooking out the water vapor and solvents in the lube system.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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