e12 lsd not locking up?

[nas80]

Tried doing a donut from standing in my e21. It spun only one wheel. This isn't supposed to happen is it?

It seems to lock ok when I come out of a junction with gusto though.

Please excuse my n00bness but this is the first time I have had a clutch type diff. Only ever had helical or viscous types. They always lock up doing the same manouver.. is this diff needing a rebuild?

[e21-Mark]

What fluid did you use? Use mineral SAE90. I wouldn't use semi or synthetic.

Do NOT use LS90 etc

[nas80]

It already had lsd oil in it. Its the diff off Miskys v8.

There's a special oil for bmw lsds, i will give it a change just to be on the safe side.

I didnt think the oil would be my problem?!

[e21-Mark]

Sideloaders don't like LSD oil. BMW actually state SAE90 mineral oil afaik. The clutch plates will lose their grip with wrong oil. If you Google a few threads you'll find people who have had the same issues.