quote:I have found, purely by accident though that synthetic MTL has some kind of a friction modifier in the stuff that restores almost all of the braking action to the synchros.
After you put it in, the box will feel tight and precise. It's really like magic.
The Red Line is also the type of synthetic that swells the gaskets to tighten them up and not cause the gaskets to shrink causing them to leak.
I would recommend it to anyone that before they tear these transmissions apart to do a very expensive rebuild, that they change the lube to this synthetic and try it. The rebuild might not in fact not be needed at all.
Doug - You recommended Redline Synthetic MTL 75/80, saying it seems to help 'correct' some second gear issues. However, the Redline MTL is a GL-4, not the GL-5 recommended by ZF.
A friend has the dreaded 2nd gear issue and has 4 quarts of the MTL ready for a pre-Fun Rally oil change, but the GL conflict is giving him some concerns.
Do you have any other thoughts to share on the GL-4 versus GL-5 issue to put our minds at ease?
Thanks!
Garth