I was picking up an oil filter today at the parts store and saw the Royal Purple Diff fluid, called "Max" something or other.

Anyway, I was looking on the bottle and it says it already has the limited slip additive in it. If I use it, do I need the GM additive? I'm going to be changing the diff fluid soon.

Thanks,
Dan

 

It already has the additive.

 

So, there is no need for the GM additive? That's great.

Without looking up the specs, how much do I need for a fluid change?

Thanks,
Dan

 

I'd say about 4 pints should do it.

 

2 quarts.