Gertag G80 LS diff..Redline 75w90?

[gman2304]

2008 Pontiac Solstice GXP with 32,000 miles and diff oil has never been changed. It has some intermittent chatter in low speed turns. Redline has the additive in it but the container says additional LS additive can be used if diff still has chatter. Should I preemptively add some LS additive when changing the diff fluid or wait and see if it even needs any with just the Redline alone? I’m also open to using a different brand of diff oil …so open to recommendations.

 

[Deleted member 89374]

You don't need to add anything to Red Line LS 75W-90 gear oil. It's formulated for limited slip. That being said, the Valvoline SynGear 75W-90 is also formulated for limited slip, and can be easily found at any auto parts store or Walmart. It's cheap, and most importantly, it's on the PRI list of approved lubricants, which means that it provides good protection against wear and tear. Red Line on the other hand is not on that list.