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You should not use any oil with an API spec higher than SE in an old engine This means it is suitable for engines built up to 1979, then SF takes over. SE has the highest permitted levels of ZDDP ( Zinc something or other) which is necessary for the heavier loads experienced on flat tappet cams. Later spec oils reduce ZDDP as it is harmful to catalytic convertors but equally as harmful to earlier engines to not have enough.

I also use the same grade oil to run in as to later use, never had a failure due to oil. Use a good quality filter NOT FRAM as I had a failure due to a FRAM filter , and just heard of another recently with the same sympthoms as I had while using a FRAM.
 
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