BTW- SWEPCO (http://www.swepcousa.com
) has a differential oil with built-in modifiers for limited-slip usage.
Rick Ellinger of RC Imports (http://www.rc-imports.com
) who races MBZ's swears by them, as well as I do (I have a 16v limited-slip diff in the wagon), and some members of the Porsche Club.
You can get them from RiteGear (http://www.ritegear.com
1988 360TE AMG