My understanding is that you cannot use synthic in the 8v92s and they strongly recommend using the straight 40 weight oil year around. I use transend synthetic in my transmission and synthetic in the differential. I also have all of my grease zerks greased with synthetic grease due useing it in extremly cold weather.
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Wally and Phyllis
1988 Newell Coach #163
40' with tag 8V92
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