limited slip differential oil?

[Jason240d]

I replaced my passenger side axle this weekend after reading the how-to's
on here. I used to be a member of the ShopForum over 10 years ago and I remember reading that if your diff cover was fined there was a good chance you had a limited slip differential. well mine is finned and the inside looks like a limited slip differential "I know it's kind of wasted on a 240d" so the Question is what kind of differential oil do I use ?