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>Ok, so how much to use, and is it for oil use only, or both oil and gas? Marvel Mystery Oil is only a oil additive. I use approximately 1/4 of a quart about every other oil change (6,000 miles). It is suppose to keep the valves from sticking. ------------------------------------- Craig Woolston '70 Sqback and '71 Fastback cwoolsto@ladc.lockheed.com