It's good measure to change the ATF and filter every 30K miles. Going over won't hurt anything, but we all should be AR about our maintenance rituals, seing as how we all spend time writing about our cars on this board. Dexron III/Mercon is the correct type of fluid to use. That's what MB uses at the dealers. I prefer Castrol, but any brand (except the cheapies) will do. NAPA fluid is also good, as it's made by Ashland Oil (a.k.a. Valvoline).

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Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'80 300SD
'85 380SE
'86 420SEL
'89 420SEL
'93 300E 2.8
'74 Jensen Interceptor Mk.III
'81 DeLorean DMC12
'84 BMW 745i Turbo