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Power Strokes
7.3 Tech
zf6 oil
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[QUOTE="jimdawg185, post: 1180365, member: 757"] If it were a sled puller I would go with one of our Duolec gear oils. They put up with some serious abuse. In the ones that spec Merc V I would use our 7500. In ones that spec XT-M5-QS I would use our 9919, or you could use one of our duolec's there too, probably 1604. Overall If it were my truck I would use 1604 regardless of which one it spec'd. 9919 is a stupid good oil, we go 750,000 in our otr truck rear ends with it. But, I like changing my oil more often and that would be cost prohibitive with the 9919, it's 450$ for a bucket. Granted XT-M5-QS is 29$ a quart..... [/QUOTE]
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