Z4m Grinding differential - Solution

[daz05]

This post is meant for information for anyone who has sufferred a vibrating or grinding LSD during very slow turns in car parks on their E85/E86 Z4m. The problem affected my car when the car was cold.

Took mine in to the local dealer and they dug up a service inspection bulletin covering the E46 M3 and various other M cars which recommends the use of BMW modified diff oil.

Here is the bimmerfest link which shows the details, SIB number etc:

http://www.bimmerfest.com/forums/showthread.php?t=...

My car is now running well again so it seems to have worked.

Edited by daz05 on Friday 27th February 15:54

[Neil.D]

My friends E46 M3 had this. Pop into the dealers and ask for the diff oil with the 'additive'. Grinding dissappeared...

It was about £45 for 2L. The diff takes 1.6 IIRC.

[kds keltec]

My E46 M3 had the same problem and also solved with oil change