Hello All,

Time to change the rear gear oil and my vehicle calls for 80W-90, (87 Camaro Z-28-stock rear) but I was wondering if I can put 75W-90 Synthetic and which one is the best out of the listed 3.

I called Royal Purple and spoke to tech support and they said I can run 75W-90 with no limited slip additive and I shouldn't have any problems since their oil has same included with it. I don't know about Mobil 1 and Red Line.

Any responses would be appreciated

 

those 3 companies pretty much own the oil market so you cant go wrong with any of them IMO...my car runs great using Mobil 1 throughout

 

I have heard that with a clutch type limited slip differential that you want to use conventional oil with additive, not synthetic. Maybe someone else will chime in to either confirm or deny this.

 

My vehicle is a Automatic 700R4.....

 

I like Redline Shockproof Heavy myself. I used it for several years in my 95 Formula with lots of 1/4 mile and roadcourse events and never had a problem out of the rear. It has the friction of a 75W90 but the film thickness of a 75W250. Also, it does not need limited slip additive (already built in) and works just fine with clutch type LSDs.

 

How well would these products work in my stock rear???

 

Should be able to use the Redline stuff without any problem. Here's the link for more info:
http://www.redlineoil.com/products_g...61&subcatID=20

 

What about Royal Purple & Mobil 1.....anybody.....Bueller....Bueller