[herbalking]

hello, i drive f30 320ed 120kw sDrive automatic. I wanna to change differential oil, what oil you recomnde? I read alot of that and someone said 75w-85 GL4, 75w-90 gl4 or 75w-90 gl5? Thanks in advice, i will probably take castrol oil. But what?

[ooshnoo]

https://www.fcpeuro.com/products/gea...ly-99991754600

[123Britt]

My understanding (Limited) is that yes a GL-5 oil will work in our differentials because the temps don't exceed a threshold where the GL-5 oil would start to potentially damage internal soft metal parts (brass) or others. Therefore, a GL-5 oil is acceptable.

Although - the BMW OEM oil is GL-4 Hypoid . FCP Euro video where they use OEM Fluid state that a GL-4 oil from other brands like Redline is good and probable better at protecting the differential.

I went round and round and ending up going OEM fluid -- even though I believe that OEM fluid was updated in 2011-2012 to a thin viscosity fluid for an ounce of fuel savings. The differential did not change only the fluid GL-5 to GL-4.

In a final word FCP Euro video says he wants to use what came in the car as does Kies Mortorsports on his own F-Series -- went OEM.

[sspade]

I used this at 60k miles.

https://www.fcpeuro.com/products/75w...red-line-50104