Stop in for a cup of coffee

Bills65Dart said

1965 225 stock Slant Six, most likely unopened, said to be around 90000 miles or in that neighborhood.

Bill

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For that engine, your choice is fine. It only needs a bit of ZDDP to make it happy and keep it running strong. It is a flat tappet engine, but not a high RPM race motor. The amount of ZDDP in that oil is plenty good enough.