Not IMO. I've driven cars for well over 150,000 to 200,000 miles with
change intervals at about 7500 miles (I do some highway driving) and never
had a ring, bearing, or valve problem or visible sludge.
There may be some particular engines or very harsh driving conditions that
may justify a flush, but today's oils are really pretty good. I don't
believe in additives for any automobile liquids either. The main purpose of
that stuff is to extract money from your wallet.
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