Transmission lifetime is usually a minimum of 250K miles. A lot depends on how the car was driven and whether the transmission oil and filter were regularly changed. That the transmission has lasted this long is a good sign that the car has not been abused. One test that you can do is, with the engine and transmission at normal operating temperatures, shift into Drive, holding the car with the brake. Keeping on the brake, shift smoothly but quickly into Reverse and measure the time that it takes the transmission to disengage and reengage the clutches. The longer it takes, the more wear there is on the various clutch packs. A new transmission will shift in a second or less; a very worn transmission could take a couple of seconds or more to take up all the slack.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970