So were you able to get most of the oil out?When I initially tried to use the "sucky" method with a Mityvac on my MY 2010 E350 I had a tough time. Following the instructions I tried to insert the tube down the dip stick and got very little oil out (less than half). After going nuts for a few days and with the help of a MB forum I found that if I:
a. Discarded the smaller hose.
b. Reversed the "plug" and forced the larger hose into the plug and DID not try to push it DOWN the dip stick hole and just used the large "plug" at the TOP of the dip stick hole. Being sure it was seated well.
Doing this the oil pumped out completely and very quickly. Whole process was clean, quick (including replacement of the filter). Took all of 10 minutes.
The instructions that came with the Mityvac were not valid for my car at all and if followed will be frustrating. The dip stick housing is the extraction tube on this car.
Be careful to check the correct amount of oil to add. (I know this oil is expensive to waste. One time in a rush I poured 1 Gal/4 Qts Amsoil Signature 5W-30 into my '04 Sienna, only to realize I didn't put the drain plug back first. Mixed right in with the oil oil!)The engine oil capacity is 6.9 quart for my 2016 e350 per the user manual. I made the mistake of putting in 8 quart before checking my mityvac 7201 reservoir to see how much i had evacuated. As I result I was overfilled by over a quart and had to suck out the excess. I also have not been successful in resetting the oil service reminder. Any help would be appreciated.