Mobil Synthetic Lubricant for differential-Question

[Bills03Coupe]

That time again to change the differential fluid in my 03. Going to use Mobil 1 Synthetic gear lube LS, 75W-90.
My question is, the lube contains the limited slip additive and states no more is required. I've also read many advise to use the
GM additive* in addition to what is in the lube. Any feedback from those of you that have used this lube would be appreciated!

*Also, the GM 1052358 is no longer available, and GM88900330 is listed as a replacement, correct?

 

[garllo]

i used a Lucas Product when I had my '98 formulated for LS differential. I never added anything more and never had a problem! When my "04 need to be changed I had the dealer do it. I have an excellent " GM World Class tech" that works on my car.