Recommended oil for a 4.10 Limited slip differential?

[atomicDog]

I have a 1995 525iT and plan to pop in a 4.10 LSD I recently picked up. Can someone tell me what the recommended oil is that I should use with this LSD? Will I need to use any additives with the oil? The differential came out of an early 90's model 525i.

[ryan roopnarine]

I have a 1995 525iT and plan to pop in a 4.10 LSD I recently picked up. Can someone tell me what the recommended oil is that I should use with this LSD? Will I need to use any additives with the oil? The differential came out of an early 90's model 525i.

if somebody's gonna argue the merits of thinner viscosity in that application, i won't bother responding. the 4.10 lsd is filled from the factory with 75w-140 synthetic oil. i dropped a tube of lsd in there for safety's sake. if you want to use a 75w90 with an LSD additive, feel free to do so, however, that isn't what it came with. i find no gain in fuel consumption using 75w140 over 90.

[632 Regal]

Ryan is correct 75-140 synthetic but I wouldnt use any additives.