I just changed the BMW "Lifetime" differential oil with Redline 75W90.

Attachment 92889
2 Quarts Redline 75W-90
2 Oil Drain/Filler plugs with Oring
14mm Hex Drive
Floor Jacks/Jackstands
Oil collection pan
Oil Hand Pump

Attachment 92883
Ensure differential oil is at Normal Operating Temperature before raising the car on jacks.

Attachment 92884


Attachment 92885
Place oil pan underneath. Open drain plug, drain and properly dispose off used oil.

Attachment 92886
Put the new plug with Oring and torque to 60NM (44 ft-lbs).

Attachment 92887
Fill the differential until oil comes out of the filler hole.

Attachment 92888
Put the new plug with Oring and torque to 60NM (44 ft-lbs).
Clean the work area, put all tools away, lower the car and enjoy the UDM :thumbsup: .

how many miles did you have?
and how did the old oil look?
was there a magnet on the drain plug?

What made you decide to change the diff oil?

I'm At 68.8K miles.
Oil is dark.
No magnet.

I don't buy their "Lifetime Oil" mantra. It's so easy a caveman can do it ^_^ .

Got it. So you probably dislike BMW's ultra-long intervals for oil changes under the included maintenance program, right?

Yes Sir. I do it at 5-7.5 K intervals.

I figured as much. I lease my 550 so I don't do that. But if I owned and wanted to keep my ride until a ripe old age, I'd change the oil every 5K-7.5K miles.

I recall BMW remove drain plug in some cars to make our life not easy to change the fluid. In this case, we will need to suck diff. oil out .... ( I don't think it will complete go out ), or open the case to let it drip. I have 2009 535xi, needs to do transfer case too. There is a big plastic cover under the case, once I hit 30K miles, I am going to do it. ( for both transfer case and diff)

Yes, I did change my oil every 5K to 7.5K depends on my schedule. Rotate tires in every oil change... I am 18K miles now, all four original tires wear even, it has been rotate three times, no ill effect happens.