My 2000 CL500 is coming up on 80K miles.
The ABC pump is a major issue for all the early ABC Mercs.
Mine was replaced at 25K Miles.
Make sure if you do get the car to Flush the ABC fluid and get the "finer"
filter and you should not have any "Lowering" issues.
I have been lucky with mine and never had a problem.

And yes. There is nothing like a good working ABC system ride.