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Slick-50
Well they got my money once.
I included it in an oil change. Ran it for 7,000-miles. I could not discern any difference in mpg. I have 375,000 miles on the car, and have documented every tank since purchased new.
Our high school auto shop instructor had admonished us to never add additives to an engine, or anything else.
I ran Red Line Racing Oil in the transaxle also, and it was a bust as well.
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Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
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