For those of you running aftermarket gear oil in the rear differential, are you experiencing any chatter which is requiring an additional shot of no slip or limited slip diff (LSD) additive?

Most after market gear oils already have limited slip additives but apparently some diffs require are more chatter prone an additional shot (up to 4 oz).

Going to run Amsoil 75W-90 and Volvo of course doesn't share their "special" forumation (produced by Castrol), so we pay an additional 100-200% for their OEM lubricants. Errrrrrgggg. Sorry, Volvo but I don't play that game with exception to the Haldex!!!!