DIY: 2006 BMW X5 3.0i: Front/Rear Diff, MT, Transfer Case Fluids

[BimmerATL]

Does anyone know a good BMW mechanic in Atlanta? I just bought a 2006 BMW x5 4.4 with 149,899 miles and I want to get fluids changed. I also have a 18k/18mo extended warranty from BMW dealership.

I plan on using Amsoil Severe Gear 75w-90 for front/rear differentials. The OEM BMW fluid in the transfer case. Possibly Redline or OEM BMW in the tranny.

[AV8R4AA]

I have found several varieties of Redline 75/90 gear oil.
Gl4 and GL5, and a few others.

I have a 2004 X5 4.4i engine.
Which flavor of oil do I need for the differentials?
I did my transmission and transfer case ( use only BMW unicorn fluid!)
Wanting to finish up the diffs.

[Bmwe5320023.0]

Amsoil lists this fluid for transfer case
https://www.amsoil.com/shop/by-produ...mission-fluid/

Looks like the same fluid as the transmission one. I guess in the end there isn't that much difference between transfer case and transmission fluid.

Normally I'd buy the dealer stuff, but one quart is $100 here in Canada. Not sure if it's better than Amsoil, which is a very reputable company.

Actually looks like if you don't have X drive, Dextron III (transmission fluid) is fine to use on transfer case.

[ThomHart]

Are our differentials limited slip? Don't think so but wanted to check because Redline has two 75W90 fluids, one limited slip and one not.

[e39_touring]

They're not limited slip, but you can use lube with or without the limited slip additive without issue.