In our transes and diffy we run 80-90 Amsoil Full Synthetic. The 140 may do ok in there but my Armada towing 11,500lbs doesn't even call for 140 in the rear diffy, although I know the rears on the Frontiers do.
-mike
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'04 Nissan Armada - '11 STi Hatch - '05 Cadillac CTS-V
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