Yeah, I was considering doing this until I realized you have to pull the driveshaft out... I have access to a lift but still seems like a pain just to change the fluid. The front drive unit fluid change is interesting as well as you access it from the frunk, and you need a drain pain with a hose attachment.
I'm really curious to see more oil analysis done on higher mileage Tesla's. The only one I've seen is the one I posted above that was apparently "loaded with iron". It's worth noting that was an older Model S which my understanding is they made changes sometime in 2015 to fix a lot of the issues they were having before, but I'm not sure how much that would change the fact the fluid is still going to have contaminants. Not sure what the long term effects on the drive unit are with 4x the level of acceptable iron... can't imagine it's good. However, I'm guessing "good enough" that the probability of drive unit failure due to unchanged fluid before the 8 year warranty is up is so low that Tesla decided it's not economically worth changing.
Makes sense though if you plan on keeping the vehicle for a while (beyond the warranty) to change the fluid.
Does anyone know if Tesla will still change the drive unit fluid upon request? If so, how much do they charge?
I had the fluid changed in both drive units in my year old S75D last week at the Rocklin CA service center for $157.