I put it in at about 52,000 miles. I am at 56,000 miles not (I don't put many miles on it anymore.) At 60,000 I am going to changes the fluid, as per the schedule.
-Jim

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1995 S350D, Green with black leather interior.
Bought January 2008 w/ 233,xxx miles.
I did 22,000 miles during the first year of ownership.