GEAR OIL
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Don't bother with synthetic crap... I worked for Dana for years in our test lab. How many failures have I seen caused by poor oil? NONE. Now, if the oil is contaminated, its a different story. I just did mine and put regular old 85W90 back in, just the Napa stuff, but I don't ever worry about it. Its a little different if you have a LSD, because you need a FM, but without one it doesn't matter.
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