Will the base oils clash? Just wondering as I have been known to top-off with (ghasp) ~other~ than the exact fill-up oil. I am attempting to top with original fill-up oil up to the 1/2 quart I usually have leftover and then add whatever for the last two months of a six-month oci. Would adding Accel SA be the best way to keep pure GC goodness flowing or will the basestocks clash making the GC loose it's cold-cranking or something worse? Maybe I answered my own question.