10th September 2007, 02:29
Join Date: Jul 2003
Location: Unit 2A, Halstead, CO92SZ, UK
E34 //M5 3.8 Avus blue
Thanked 206 Times in 137 Posts
The transmission fluid in the Getrag 280/5 & type D 6 spd breaks down far quicker than the differential oil.
It also tends to have far more particle debris in the oil than the differential.
I change my diff & trans oil once a year...next weekend in fact.
Theres little doubt in my mind that it contributes greatly to durability.
If, after changing the oil, gear clash or slight baulking of the shift is present,]
check the shift linkage.
If all looks ok, check the clutch for wear & proper disengagment.
Bleeding the clutch slave cylinder can sometimes help.
Its overlooked alot.