Our place recommends every 40-50k. Since MB says "filled for life," you may find varying reccommendations based on who you ask.

almost forgot, on the 722.9 the fluid has to be checked when the temp of the fluid is between 40-45 C, this can make for added "fun" (read: delay) when working out issues on these transmissions. I remember in the beginning they said the fluid was "at the correct level" when it drains out and the fluid stream is about "the size of your finger." Whos finger? My finger? your finger?

What was wrong with a good 'ol dipstick? I miss those sorry to rant, trans fluid has got to be the #1 automotive fluid I hate messing with.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350