What is the best rear diff fluid to use?
I've got some 70w90 Amsoil SVG left. Does it need any LSD additive to be used in the rear differential? I just replaced it with DiaQueen but wouldn't mind finishing off my Amsoil SVG if it doesn't damage my rear diff.
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I try to change mine every 5K or twice a year, whichever happens first, LOL.

