i can't find de drain
it is due for an oil change
take it to your local quick-e-lube.
Approximately $225 and it's basically a oil change.
Mercedes recommends that each of their vehicles use a certain synthetic oil. The ML350 is recommended to use 5w 30 synthetic oil only.
it takes up to 8 quarts of oil
9 quarts
8.5 US Qt. (LasVegasEd) including filter
How to change or add transmission fluid to a ml 350 benz
Change the oil filter every time you change the oil.
Mileage or once each year.
If it is the synthetic blend, you should change the oil every 3,000 miles. If it is a full synthetic, you should change the oil every 5,000 miles.