After-market oil additives: Why bother?

摘要

There are scores of second-market oil additives available. You've heard their claims: They'll extend oil life, save you money, and reduce wear on engine parts. True? We asked a few experts. Their answer, generally, went something like this: "They work, but who needs them?" In Eureka, "No one has been using that stuff much, at least the guys who come in here," said Mike Barreto of Trinity Diesel Supply.