Rear differential Fluid change

[M2_MEDUSA]

Anyone know how often rear diff fluid needs to be changed?

[Dabeamerking]

Every 20,000 to be safe. It’s $60 for one bottle. I do a lot of drifting and donuts so I am a bit of fnatic and change mine every 10,000. I had a friend drifting every weekend and at 9,000 was almost empty. If you drive normal and civilized you should be fine with 25,000-30,000

[Track/S]

Originally Posted by Dabeamerking

Every 20,000 to be safe. It’s $60 for one bottle. I do a lot of drifting and donuts so I am a bit of fnatic and change mine every 10,000. I had a friend drifting every weekend and at 9,000 was almost empty. If you drive normal and civilized you should be fine with 25,000-30,000

What oil costs $60 liter/quart?

[Dabeamerking]

Sorry I meant to say one diff oil change. It’s 2 bottles for $60 that are required for it

[Track/S]

Originally Posted by Dabeamerking

Sorry I meant to say one diff oil change. It’s 2 bottles for $60 that are required for it

[Tommix]

Rear diff oil change interval in EU cars is 60 th km (37 th miles). I personally change the oil every 10-12th mile. You need 1 l of BMW diff oil (part no: 83 22 2 365 988) and 2 x Screw plug with O-ring (part no: 33 11 7 525 064).





After 35 th miles diff oil looks like this:



Oil was dark but there was not any particles or sediment.

[AlmondJayRoM3]

Originally Posted by M2_MEDUSA

Anyone know how often rear diff fluid needs to be changed?

Differential fluid is due every fifth oil change or no later than 50,000 miles/60 months.

See post below for maintenance intervals. Towards the bottom.

https://f80.bimmerpost.com/forums/sh....php?t=1501292

[M3ntal_F80]

Originally Posted by AlmondJayRoM3

Differential fluid is due every fifth oil change or no later than 50,000 miles/60 months.

See link below for maintenance intervals:

https://www.bimmerpost.com/forums/sh....php?p=2333538

I think you posted the wrong link.

Coming up on 50k myself. I'll be doing this as well as the oil. Going to do the spark plugs and coil packs while I'm at it. Anything else I should tackle while I'm at it?

[M2_MEDUSA]

Originally Posted by Lj_F80

I think you posted the wrong link.

Coming up on 50k myself. I'll be doing this as well as the oil. Going to do the spark plugs and coil packs while I'm at it. Anything else I should tackle while I'm at it?

Is there a DIY somewhere

[Kilabyte]

Originally Posted by M2_MEDUSA

Is there a DIY somewhere

Lift car, drain fluid, replace drain plug, remove fill plug on the side, fill, replace fill plug

Easier than an oil change.

[M3ntal_F80]

Originally Posted by Kilabyte

Lift car, drain fluid, replace drain plug, remove fill plug on the side, fill, replace fill plug

Easier than an oil change.

I recommend removing the fill plug first, in case it strips or won't break loose.

[Track/S]

Originally Posted by Kilabyte

Lift car, drain fluid, replace drain plug, remove fill plug on the side, fill, replace fill plug

Easier than an oil change.

I have changed the oil in my diff 4 times, never changed the plugs.

[AlmondJayRoM3]

Originally Posted by Lj_F80

I think you posted the wrong link.

Coming up on 50k myself. I'll be doing this as well as the oil. Going to do the spark plugs and coil packs while I'm at it. Anything else I should tackle while I'm at it?

Thanks for letting me know. Correct link below. Schedule towards the bottom. If you are doing the spark plugs change the air filters also. I wouldn’t change the coils at 50k unless you are having misfires or seeing some kind of issue with the insulation on the coils.

https://f80.bimmerpost.com/forums/sh....php?t=1501292

[M3ntal_F80]

Originally Posted by AlmondJayRoM3

Thanks for letting me know. Correct link below. Schedule towards the bottom. If you are doing the spark plugs change the air filters also. I wouldn’t change the coils at 50k unless you are having misfires or seeing some kind of issue with the insulation on the coils.

https://f80.bimmerpost.com/forums/sh....php?t=1501292

From what I've been reading, most recommend to change them out while you're in there. I'll probably just do it to do it. Don't want to have to worry about it before the next coil change. Got Eventuri intakes, so won't need to change filters, but I do need to change out the cabin filter, thanks for reminding me, lol.

Would it be worth changing out the transmission fluid. I've got the DCT and I haven't had any issues with shifting.

[AlmondJayRoM3]

Originally Posted by M2_MEDUSA

Is there a DIY somewhere

Search YouTube. Help Me DIY has a few good maintenance videos covering the F8X including the differential service.

Otherwise it’s pretty much as simple as what Kilabyte said.

Some other stuff to keep in mind:

1. There’s a note in the procedure to change the fluid at normal operating temperature. Probably because it’s thick and to get wear products into suspension.

2. F80 Differential fill and drain bolts are torqued to 45 Nm, not the 60Nm that the video on youtube says. This bolt is utilized in other applications where it is torqued to different values.

3. Ensure the car is level when filling the differential.

[jfritz27]

Originally Posted by AlmondJayRoM3

Some other stuff to keep in mind:

1. There’s a note in the procedure to change the fluid at normal operating temperature.

Yep -- and if you do it this way (and thus get a really good drain, letting it sit, etc), it does take slightly more than 1 L to fill it up fully