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. As you said, it is relatively cheap to test the oil, Those testing folks can tell you what is going on without guessing. Unless you plan to do a cross country trip tomorrow, let the truck sit there for a few days and get answers. .

. You could order a sample bottle from a company and have your motor oil analysed. There are companies that do that sort of thing for a living. They should be able to tell you what is in there besides oil. Search here for " Blackstone Laboratories" as one possible option. (No, I don't work...