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[2woody]

If it still judders, you'll be ok. AFAICT, the damage is pretty instant.

[feeutfo]

Well that was my thinking, at one point. It was juddering nicely earlier.

Does temperature come into it? It seems to judder more when hot?

[2woody]

I'll need to think about that one......

[feeutfo]

Might not be working when cold.

[aaronjb]

the friction surface on the slip plates is usually a copper-based sintered material. The hypoid compound in the oil binds chemically to the copper, thus stopping it working. Permanently. This means that even an oil change won't correct it. The only option is to replace the plates.

Cone-type LSDs and plate-type LSDs are very often mistaken. Cone will tolerate hypoid compounds.

can't tell from RealOEM

Cheers for that - I did wonder, that explains it nicely

Actually more googling implies the E36 had a plate LSD and the E46 has some kind of hybrid viscous coupled diff, which probably explains why hypoid works (but not - to me, anyway - why you'd need the friction modifier). Anyhoo.. back to Chris's clunking

[feeutfo]

Just checked. It's an 80/90.

[feeutfo]

This one.

http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_220229_langId_-1_categoryId_255220#tab2

[feeutfo]

Link seems to imply muti grade is ok on friction plate LSD.

http://www.redlineoil.com/product.aspx?pid=41&pcid=4

[feeutfo]

Well, compared to Taxi Al's car mine judders like a good en. So not a lot wrong I suppose.

[aaronjb]

I ordered the additive today .. have we established that it is or isn't OK to add to your diff? I'm not quite sure, now 

[feeutfo]

Have to admit to some fuddlement.