GL5 Oil question about the synchros.

[TSIinyourEYE]

I destroyed a diff and required a new casing for my trans.. i did that put it all back together and thought i could just throw some 75w90 in. not realizing i couldnt use GL5. (castrol gear oil)

now anytime i shift. and the synchros are matching. i am having ton of chatter. sounds like a bad skateboard bearing. the TOB is 4k miles old and spun flawelessly. the c clip was fine.

im wondering can i just drain the fluid and refill with a better DSM friendly gear oil and it may go away. or by this point are they pretty much gone?..

ive only put probably 400 miles on it with the GL5 and this started around 200.

[BadAss4Bangers]

Originally Posted by TSIinyourEYE

I destroyed a diff and required a new casing for my trans.. i did that put it all back together and thought i could just throw some 75w90 in. not realizing i couldnt use GL5. (castrol gear oil)

now anytime i shift. and the synchros are matching. i am having ton of chatter. sounds like a bad skateboard bearing. the TOB is 4k miles old and spun flawelessly. the c clip was fine.

im wondering can i just drain the fluid and refill with a better DSM friendly gear oil and it may go away. or by this point are they pretty much gone?..

ive only put probably 400 miles on it with the GL5 and this started around 200.

Is the TOB OEM? If not, it could have blown already since aftermarket TOB's are notorious for that. I would just try draining the oil and throwing some Redline MT90 (my personal preference) in there and see if it helps. You can pick up that oil from extremepsi.com btw.

[BISHILVR]

Or for the time being throw some cheapo oil in it and see if the sound changes at all.

[DSM Bud]

Redline MT90. That shit is liquid gold!!!! It's pretty pricey and I have to go two cities over to get it, but thats the only oil I'll run in my trans.

[GsxHybrid]

+1 MT-90 the shit! I also use some light weight shock proof.

[wrencher]

For future reference GL5 has special additives like high sheer plus others for differential gear operation. These additive packages are not brass friendly.
Also not conducive for the best blocker ring operation.
GL4 is made/recommended for a reason.

As said above redline is the ticket.

[Red1991TSI]

I ran GL-5 oil in my trans for years. I run Penzoil synchromesh now. Transmission still shifts fine after 206,000 miles. I highly doubt your problems are caused by GL-5 oil run for a few hundred miles.

I agree though you should be running something else, either GL-4, synchromesh, MT-90, or the new Diaqueen.