Wel I'm about to change my tranny fluid, and i would like to know what would be the best fluid out there for the wrx?

 

the opinion has been 50/50 on this topic. some say go synthetic, while some say it may be took slick, so stick with the stock fluid.

 

i heard someone talking about NEOsomething. it was suppose to get rid of the whining noise that our trannys make

 

After many hours of research, I changed my trans lube at 24k miles.
I used 2qt. regular 80w90 Valvoline dino GL5....1qt. Shockproof lightweight, and the remaider GM Synchromesh.

6k miles later, it shifts like better than butter....no grunches, or grinds unless you consider carless engagement on my part by not pulling it into gear far enough.
I WILL use this 'cocktail' again. I am very happy with the results.

 

I am trying out Redline Lightweight ShockProof Gear Oil. Funky bubblegum blue colored one.

So far so good. It supposed to help keeping the gears happy during "shocking" them with shifting.

 

That is why I deceided to use what I did, and the GM Synchromesh was developed by GM to help reduce failure of their MT's which, like ours, were designed for a lot less HP than they were eventually asked to withstand.
I couldn't be happier with my trans now, and the couple people who I have let drive it thought I had a new trans installed.
It is a remarkable difference, even if I have to change it every 10k or 15k miles it would be well worth it

 

i have used the old redline stuff. smoother when hot then stock, but when cold stock worked the best. i might just have to try the newer redline stuff.

 

I'm running Motul Gear 300. It's been in for about 10k and it's been very good. I'm not a big fan of Redline due to it's molecular composition. It's a little thin for anything other than race cars.

 

When should you change tranny fluid ? I've got 10K on the stock fluid ....

 

Assuming your driving a MT, it really depends on how you drive. If you are harder on your trans(auto x etc), I'd change it every 15-20k miles. I went w/ 30k miles.

 

i'm glad others are giving the syncromesh a shot. a lot of folks dismiss it out of hand, but i've found it works pretty damned well.

first i had used it to top off the OEM fluid. it improved the 1st gear issue, even with only a few ounces of fluid added.

then, when i changed fluids at 10k, i went with 1/3 syncromesh, 2/3 mobil 1 synthetic. if i really rush 1st gear coming to a stop, i can initiate some grind, but 95% of the time a slow pressure will pop it right in, even while rolling at ~10 mph.

jm2c
ken

 

Anyone have a GM part number for their synchromesh fluid? I think I wanna give this stuff a try in a tranny fluid cocktail.

--
0==WW==0
"…axles of evil…" - george w. bush

 

ww,

i picked it up at my local autozone. they had it right on the shelf, collecting dust.

not sure if you've got autozones in your neck of the woods, though.

i'd have to get back to you with the GM P#.

ken

 

Actually, there are Autozones in my neighborhood. I'll swing by there today and check it out, thanks.

--
0==WW==0
"…axles of evil…" - george w. bush