fluid questions

[HPIA4v2]

Originally Posted by KDAWG97M3

hey guys not a BMW noob, but maybe a x5..

couple of questions...

i get the debate on the tranny fluid to change or not...not sure there...


but the rear diff fluid...mobile 75-90?? can i put in 75-140 due to some mild towing?? what do we need for my front transfer case? i have 2001 x5 4.4

also thre seems to b a small leak on my transfer case as well?? any ideas?

brakes will be flushed with BMW dot 4

PS looks good..

Green coolant...not good..will get flushed. Any thing i am missing?? thanks for the help.

KDAWG

I use Dextron III for my xfer case. Maybe the trace of fluid is just from last flush.

Yes I always use BMW brake/coolant.
As far as diff, I stick with 75-90 Redline/M1/RP and leave the heavier weight for LSD (limited slip diff) kind, but I doubt it'll do any harm with you go with heavier oil on your X5.

Welcome to the board.

[JCL]

I'd stay with 75w-90 for both differentials.

Since your vehicle is pre x-drive, use Dexron for the transfer case.

[KDAWG97M3]

Originally Posted by HPIA4v2

I use Dextron III for my xfer case. Maybe the trace of fluid is just from last flush.

Yes I always use BMW brake/coolant.
As far as diff, I stick with 75-90 Redline/M1/RP and leave the heavier weight for LSD (limited slip diff) kind, but I doubt it'll do any harm with you go with heavier oil on your X5.

Welcome to the board.

Good question....do I need LSD fluids. Or bc we are AWD, no need?

[JCL]

Neither differential is a limited slip design. Limited slip differentials that have clutch plates use special LSD fluids. The X5 uses wheel brakes for traction control.

[KDAWG97M3]

Thanks..now should I put 75-140 or stay with 90 some towing will be occurring, that is why I ask?