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Irv runs a 4 cyl cast iron block, and he runs it! You have a 4 cyl aluminum block with an oil cooler. I doubt you ever get the oil very hot to prevent sludge buildup which will cause considerable damage as the engine gets older. Remember, antifreeze will get much hotter than engine oil.
Use full synthetic, all the time. Otherwise your PCV breather will get clogged and the seals will start blowing out. Then you can reduce the flush interval to 5-6,000 miles instead of every 3K.
Klaus
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Volvoless. Its been 90 days. BUT I am getting a 1966 122 soon.
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