7500 mile differential gear - oil change ?

[Weezz]

Car: 2002 Pontiac Trans Am-M6 @ 7600 Miles

I'm ready to pull the cover on the differential, clean it out, and fill it with new fluid.

I'm leaning towards the Red Line 75W90 with the incorporated friction modifiers(not the 75W90NS), but was also considering using Royal Purple 75W90 lube.
Help me decide, which would you use?

Or even give me another option not mentioned, I plan on keeping this car till it dies.

TIA!

[ March 26, 2003, 04:06 PM: Message edited by: Weezz ]

 

[MolaKule]

Redline would be my choice. But I would still have a UOA done every 15-30,000 miles.

 

[sprintman]

I have RL 75W90 in my Outback diff (75W90NS in trans). I'm sure diff is running cooler than with the OEM stuff.

 

[wtd]

I run 75W-90 Mobil 1 diff oil in my 98 ext-cab Z71 and had an oil analysis done on the oil with 25,000 miles on it. I also tow occasionally. The analysis came back good and to recheck in another 15,000 miles.

Wayne

 

[vettenuts]

I switched my Suburban to Redline a few years ago and developed a leak soon after. Not sure if Redline was the reason, but it left me a little gun shy. I changed my Vette over to Amsoil 75W-90 last year.