Hello! Recently bought a 2017 BMW X5 with 50k miles on it. About 4 months ago the previous owner got a 50k miles service done at the dealership. Upon closer inspection to what was actually performed on the vehicle, it looks like the dealer used BG products from the front and rear differentials, transfer case and brakes. I would have thought a BMW dealership would use BMW products...
Front Diff spec is BMW Rear Hypoid Oil G2 75w-85 GL-5, they filled it with BG Ultra-Guard LS 75w-140 GL-5.
Front Diff spec is BMW Rear Hypoid Oil G3 75w-80 GL-5, they filled it with BG Ultra-Guard LS 75w-140 GL-5.
Holy efficiency loss! I am going to get some 75w-85 GL-5 and redo both.
Transfer case spec is Shell S-Tech TF0870, and they filled it with Synchro Shift II 75w-80 GL-4. Here's the synchro shift PDS
https://www.mustang6g.com/forums/attachments/792_spec-2017-new-pdf.168172/
Brake fluid was BG DOT 4, but they also added some sort of "conditioner". Further they added some "ethanol treatment" fuel additive.
I'm really surprised a BMW dealership would be using off brand and out-of-spec products. Should I be worried about the transfer case fluid at all? I know that has a chain drive and wet clutch so I am thinking the fluid friction properties might be particularly important for clutch wear.