Royal Purple question

**LOCKDOWN** · 03-29-2007, 08:42 AM

I just bought this for my M6 car. I guess I should have asked first, but just making sure for the last time before I put this in my car that this is the right stuff. thanks

**silverz28camaro** · 03-29-2007, 09:09 AM

yes. i have it in my 2000 z28 auto , running 12.9 @109 no problems.

this fluid is compatable with all posi units and is a 75 90 weight whick is a little lighter than regular gear oil but works great, this slightly thinner oil helps dissapate heat and reduces drag.. good stuff i also use 10w 30 in my engine

**LOCKDOWN** · 03-29-2007, 09:21 AM

Thanks, all ready to put it in and start the season now

**stanger88** · 03-29-2007, 09:24 AM

I run RP 85-140 in my diff (stock Tosen)

**dxdenis02** · 04-03-2007, 08:07 AM

I run RP 85-140 in my diff (slp Tosen hd)

**INMY01TA** · 04-04-2007, 06:04 PM

Originally Posted by silverz28camaro

yes. i have it in my 2000 z28 auto , running 12.9 @109 no problems.

this fluid is compatable with all posi units and is a 75 90 weight whick is a little lighter than regular gear oil but works great, this slightly thinner oil helps dissapate heat and reduces drag.. good stuff i also use 10w 30 in my engine

Actually it's not. Not supposed to use syn if you have the Auburn diff. Personally I'd use regular dino 80/90. I tried Redline in my old 10 bolt years ago and started getting one wheel peels.

**LOCKDOWN** · 04-05-2007, 10:28 AM

Originally Posted by INMY01TA

Actually it's not. Not supposed to use syn if you have the Auburn diff. Personally I'd use regular dino 80/90. I tried Redline in my old 10 bolt years ago and started getting one wheel peels.

This is probably a stupid question lol, but how do I know if I have the Auburn diff. ?

**INMY01TA** · 04-05-2007, 03:47 PM

I don't think it was an option for a 99Z.

**LOCKDOWN** · 04-05-2007, 08:02 PM

Originally Posted by INMY01TA

I don't think it was an option for a 99Z.

ok, thanks

**SteveC** · 04-13-2007, 05:41 PM

Originally Posted by silverz28camaro

this fluid is compatable with all posi units and is a 75 90 weight whick is a little lighter than regular gear oil but works great, this slightly thinner oil helps dissapate heat

Incorrect information, Aubern recommends not using synthetic oil in their posi units, and the THICKER the oil, the larger the molicules, which disapates heat quicker. I use 85W-140 dino oil.

SteveC