Came here to say this. I use Lucas Oil 75-W90 with no friction modifier in my TrueTrac. Using synthetic oil and/or friction modifier in a worm gear diff actually lowers the bias ratio.If you are using something like an eaton tru-trac differential, dino oil is used, no synthetic, and no friction modifiers.
RP synthetic differential oil comes with the friction modifier. I don't know anybody who has used it, so can't comment on it.
Came here to say this. I use Lucas Oil 75-W90 with no friction modifier in my TrueTrac. Using synthetic oil and/or friction modifier in a worm gear diff actually lowers the bias ratio.
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Oil? It gets a freaking sticky.
http://www.s197forum.com/forum/showthread.php?t=81441
Do 3V headers get a sticky? Fuck no!
the issue could come up "if" you ever have a engine warranty issue. It's possible that they could ask you to prove regular oil changes and then see you used a oil not spec'd for the motor.
IMO, synth is worth the cost, it lasts longer and should give you better gas mileage.