Quote Originally Posted by garett View Post
drop the oil and try a GL4 grade oil.
X2
The 4.2's defiantly need a gl-4 oil in their manual transmissions!

I've been using penrite 75-85 full synthetic for years, makes it a pleasure to drive and my GQ has just gone over 400,000kms.

The gl-4 oil helps the synchros. Gl-5 oils make the transmission very difficult to shift between gears.