Which Differential oil? BMW 330d

[nomis36]

I've had my diff rebuilt with new pinion bearings...... again! Long story which i won't go into now. I simply must refill the diff with the very best oil i can for piece of mind it wont fail after a couple of weeks like last time!
The diff in question is a 2.35 ratio 215l open diff with a quaife atb lsd fitted. Quaife say just use the oil as specified by the manufacturer of the car which in my case is 75w90. I've been doing some googling on this and there seems to be quite a few people saying use 75w140.
Does anybody have any advice before i err on the side of caution and use 75w90?
Thanks.

[E-bmw]

75/140 is VERY thick, I wouldn't expect that in a diff.

[stevieturbo]

nomis36 said:

I've had my diff rebuilt with new pinion bearings...... again! Long story which i won't go into now. I simply must refill the diff with the very best oil i can for piece of mind it wont fail after a couple of weeks like last time!
The diff in question is a 2.35 ratio 215l open diff with a quaife atb lsd fitted. Quaife say just use the oil as specified by the manufacturer of the car which in my case is 75w90. I've been doing some googling on this and there seems to be quite a few people saying use 75w140.
Does anybody have any advice before i err on the side of caution and use 75w90?
Thanks.

Use whatever oil whoever built the diff recommends, failing that whatever BMW recommend.

Although chances of the oil actually causing a failure are very low.

75/140 isn't really any thicker than 75/90, but some might recommend it for extreme usage applications as it will remain good at higher temperatures.

[GreenV8S]

Given the choice between the manufacturer and 'quite a few people' I'd go with the manufacturer.