I think that your car would have the 722.6 transmision and as such has no dipstick. Apparently these tranny's are VERY sensitive to level and quality of fluid and MB want's you to have the dealer check/maintain the fluid level. I think if you try a search you will find all kinds of good info.

Cheers,
Matt

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next oil change -C230- 160000 Km
-Mustang- 70000 Km