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The regular blue-bottle STP Oil Treatment will not hurt your engine, and it will help to reduce oil consumption a little.
I run STP with every oil change and think its good stuff. Try getting a little on your fingers sometime and you'll see how slick it is - I credit it for giving me 350k miles on a GM 2.8-liter engine without any engine work, and still going.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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