My 92 500E has 122,xxx miles and I'm going through and changing all the fluids. The transmission fluid is looking old, has a slight brownish-red hue but smells ok. I can't find a trans fluid and filter change receipt in the service records.
The trans shifts fine and my reverse gear engagement feels healthy (which seems to be a pseudo litmus test for trans health).
Im concerned that I may induce a trans issue by changing the fluid out. I used to have old Range Rovers with ZF transmissions and if you were to change the fluid in one with high mileage you ran the risk of ruining the trans.This was due to the fact that you'd be removing all the acquiesced clutch material with the fluid. Once the "slick" new fluid was introduced the trans would start to slip. I'm hoping this isn't the case with the 722.3 unit in the 500E.
Any risk in changing the fluid on a high mileage car that potentially hasn't had a change in a long time?
Thanks in advance for the info.