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6.7 Tech
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[QUOTE="webb06, post: 745844, member: 7680"] All we run is the schaeffers 5w-40. We have a rep that comes by and sells to us. I don't remember him ever saying anything about a synthetic 15-40. Guess I'm wrong though. We run schaeffers in all of our customers trucks, as well as our powerstrokes, and the series 60 detroits in the charter buses. No problems whatsoever [/QUOTE]
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