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Old 09-30-2016, 06:52 AM   #13
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,617
People often overlook the fact that diesels do not use catalytic converters like gas engines, and continue to use high ZDDP concentrations because of the bearing loads created by tier much higher cylinder pressures. They also tend to have higher detergency additive packages as well.
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