Quote Originally Posted by tom4bren View Post
Yes. There is a special additive for Limited Slip Differentials. Most stores carry a selection of gear oil that already has it mixed in.

The jury is still out on whether it's needed if you are using synthetic but I've even seen the synthetic that already contains the additive.
Yeah, I know Royal Purple has the additive and nothing had to be added when I had mine switched over to all synth. I'm not sure, but I think reading here somewhere that Amsoil does too...but would have to look into that.