Need some advice. Just bought a Moser 12 bolt with limited slip. Instructions say to use 80-90 petro base oil. Parts guy and friends say to use Redline synthetic. Any advice would be helpful.

 

I cant remember exactly. I wanna say that it doesnt matter either way as long as you use the proper weights. and since its a posi you will want to get a little bottle of additive as well

 

[&:] while i think synthetics are far superior i also listen to manufacturers when they recommend certain products for stuff they design and build. i suspect that moser wants petro based cause they have designed the clutches or cones in the posi to operate properly, or just like an engine they may want the petro based in there for a break in period, with the friction characteristics of a petro based lube. there may also be warranty issues here. i have not seen synthetics adversly or negatively effect anything ive used them in (best sh*t available) including diffs trans, engines, greases for brake parts etc etc. if it were me id use petro base for the first 10k miles or so and then switch to synthetic. they are just so much better in every way kurt

 

It made me wonder when they said no synthetic. I agree with you that they are much better. Sounds like good advice, I will use petro base for about 5K. Thanks .