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Maybe a stupid question, but, talking to local shop owner yesterday, says he uses motor oil as a fuel additive, about a quart to 30 gal diesel. Swears it improved mileage on his duramax 2mpg and on his sons 7.3 PS 3 mpg. Anyone ever heard of this? and/or next question what is the preffered add for a "02 ps 7.3? lots of good stuff here, learning daily!!!! thnx
 
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