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I believe that much or even most of the "Recommended Service" on cars is purely to keep us digging into our wallets. It's based on engine and lubricant technologies that have been outmoded for half a century.
I can remember when they recommended oil changes every 1,000 miles - but the oils then were primitive, often merely filtered and recycled. No modern additives, nothing but raw petroleum oil. (They sold it in glass bottles with pour spouts, from wire baskets at every gas pump!)
Today, they try to make you feel guilty, stupid or both unless you get their full service deal once a month or so.
Balderdash.
Gas and oils are better, additives are doubly better and engines are trebly better than when such rigorous maintenance practices were truly needed.
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