XSeries-forum

I would like to change the diff and gearbox fluids on my ancient X3 with 166,000 miles and was wondering if there are any brands used by forum members?

I recall someone on here recommending Red Line gearbox oil as being superior to most of the other brands. Is there any particular differential oil I should use?

I had a transfer case rebuild in 2019 so assume the BMW fluid was changed then.

If you put the last 7 characters of your VIN into Realoem (BMW Parts database copy) it will give you the BMW fluid types under the relevant sections that you can then search for an equivalent type.