I have read from the various posts that you should not substitute the Mercedes synthetic fluid for anything else on these transmissions not even Mobil synthetic trans fluid.

Any Mercedes dealer should carry the "special" Mercedes transmission fluid or you can order it through the MercedesShop website.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles