That's what I'm using. 180,000 miles. No tranny problems.SeattleJeremy wrote:I've been really happy with Valvoline Synthetic 75w90.
I'm using a gl-5 fluid (Mobile 75w-90 synthetic) in my 05 base... haven't noticed any grinding after changing it 3k + miles ago. I know the 05 manual reccommended gl-5... is the manual just wrong?star_deceiver wrote:Redline MT-90 GL4 is what I use, 2 bottles. DO NOT PUT A GL5 FLUID IN YOUR TRANSMISSION, IT WILL GRIND.
Brake fluid: Unless you have a leak, flush the system when you change your brake pads.
Could be, the manual is wrong in some places. But then again, things have changed in the transmissions so your manual could be spot on.johnz wrote:I know the 05 manual reccommended gl-5... is the manual just wrong?
My car has 138k miles on the OD, replace the gear oil every 30k with Valvoline full synthetic 75w-90, and it has brass shift linkage bushings. I haven't experienced any issues getting it in to gear.biodieselrabbit wrote:Man I should have asked this question before replacing my manual transmission fluid. Earlier this year when it started to get warm I replaced the fluid with Valvoline full synthetic 75w-90 gear oil (GL-5, MT-1). Didn't notice much until it became relatively cold again. These days it is extremely difficult to get into gear and shifting is anything but smooth until the transmission has warmed up (a while after the engine temperature gauge reads "normal"). I thought it might be a sloppy shift linkage but now I am suspecting the manual transmission fluid. Anybody else have a similar experience? How much damage have I possibly done to the synchros?
Yes.biodieselrabbit wrote: Anybody else have a similar experience? How much damage have I possibly done to the synchros?
GL5 gear oil will eat your brass synchros, which are in the base and GT vibes. I am not sure about the model years unfortunately. Regardless of what the manual says (dexcool...hahanooo), only use GL4 in these transmissions.johnz wrote:I'm using a gl-5 fluid (Mobile 75w-90 synthetic) in my 05 base... haven't noticed any grinding after changing it 3k + miles ago. I know the 05 manual reccommended gl-5... is the manual just wrong?star_deceiver wrote:Redline MT-90 GL4 is what I use, 2 bottles. DO NOT PUT A GL5 FLUID IN YOUR TRANSMISSION, IT WILL GRIND.
Brake fluid: Unless you have a leak, flush the system when you change your brake pads.
Interesting reading, but being 6 years out of date it's probably not as useful as it once was. Royal Purple, for instance, is now a completely different formulation (they complain bitterly about it over on BITOG forums).acvw74 wrote:I nearly purchased Royal Purple...that was until I found this "white paper"