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1991 300SE, 2015 ML350
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Below works on my 2015 ML350

1. Don't press brake pedal, but push start button once (or turn key to first position).
2. Scroll center display to show mileage (trip and total miles).
3. Press and hold Call button on right steering wheel.
Quickly press and hold OK button on left steering wheel.
Hold both buttons until graphic appears.
4. Scroll down to Assist Plus.
Press OK
5. Scroll to Full Service.
Press OK
6. Scroll to Confirm
Press OK.
7. Select Oil Grade.
Press OK
 
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