Quote:
Originally Posted by SEVEN40iL
So I should be looking at flushing the transfer case, instead of the differentials? Or may as well do them at the same time since I don't have any records of it ever being done?
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I changed my diff fluids at 200,000kms, just because. Used Red Line Synthetic 75W90 GL-5 - as the web page says, this is the "go to" oil for most diff appllications.
https://www.redlineoil.com/75w90-gl-5-gear-oil
The old rear diff fluid looked ok. The old front diff fluid was much darker, due to the heating cycles the front diff experiences, being mounted to the sump.
Access to the front diff is via the reinforcing plate under the engine. I won't mention the "use once" bolts on this plate...
Changing the diff oils made zero detectable difference to the driving experience.
I wanted to change the XDrive fluid at the same time but I cannot find a source for the fluid locally and I need to get DIS running so I can reset the oil wear adaptations after the change. It's still on my to-do list.