where do you check to see if engine needs oil. on 2011 Mercedes-Benz E550 4MATIC

I notice only one port for adding oil located at firewall

by in Springfield Gardens, NY on November 27, 2013
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2 answers
ANSWER by , November 27, 2013
If you have the owners manual it will show/tell you how to check the oil.
ANSWER by , November 28, 2013
Possibly through the information display menu.Electronic level sensor , likely , not dipstick. A dipstick would be to low-tech and easy!