grinding in first

[krammit]

I don't get it. I've had the car for 5 yrs. and never a problem, but I go and change the tranny oil and now when I gear down into first I get a grinding happening.It did'nt do on the way to get the oil changed but after the change, the grinding.All that was done was old oil out and new oil in.What in the world would create this problem,I really don't see how anything can change the gear meshing from an oil change.
Please, someone give me info or maybe a similar situation, thanks in advance.

[Mirko]

Old oil is thick...

I heard, putting sawdust in the trans will tighten it up, you know... if you where selling a car. Anyone else hear that?

I'm sure Bruce will have an explanation.

Mirko

[Bruce]

What kind of car are we talking about?
What oil was put in?

[owdlvr]

What kind of car are we talking about?
What oil was put in?

x2.

The oil you use makes a huge difference.

-Dave

[Bruce]

If you took it to one of the chain lube joints, I bet they put ATF in it.

[krammit]

they said they put synthetic oil in.I can't remember the weight he said, I think one of the numbers was 75?!

[Bruce]

My Mexican Beetle has Amsoil synthetic 75W-90 in it and it shifts fine.
What did they charge you for the grinding upgrade?

[owdlvr]

Chances are they put a GL-5 compatible fluid in, which may not be compatible with your GL-4 trans (regardless of what the bottle says). I've done a lot of research and testing with VW/Audi transmissions and various fluids with my rally car. There's a good chance your trans is worn, and the new fluid is magnifying the problem. Safe bet oils that you can buy easily are:

Motul Gear 300
Redline MT-90

I had Amsoil eat the brass syncros in one of my Audi transmissions...won't touch the stuff now.

-Dave

[Bruce]

I had Amsoil eat the brass syncros in one of my Audi transmissions...won't touch the stuff now.

Let's see these synchros.

[owdlvr]

No photos, which I do realize makes it an 'internet story'. If you're really bored you could head to Audiworld and search under user OWDVLR for the whole story and posts.

Long story in a shorter version is that sometime around 1999/2000 I put Amsoil 75w90 GL-5 spec fluid in a transmission which had no issues previously. Even though it was supposed to be GL4 compatible the syncros began having issues within the month. I had a few long discussions with Amsoil Canada and US (I was doing the tradeshow route for Vibrant and ended up beside them at most shows). End of the story with Amsoil is that they wouldn't or couldn't confirm that their gear oil was indeed yellow metal safe. The Motul rep at the time was quite interested in this whole story and had France send through the data sheets proving their gear oil was no problem. I've been running Motul Gear 300 ever since in any VAG transmission, I've never experienced anything but improvements with it.

-Dave