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Message: <blockquote data-quote="Ruger" data-source="post: 644197" data-attributes="member: 1594">Since availability of gear oil with out friction modifier is limited, what drawbacks are there if you use gear oil with friction modifier in the differential?  That's question number one.Question number two is this:  If you use 75w140 with friction modifier, do you get the power associated with a lighter gear oil AND the wear protection of the heaver oil?</blockquote>