I don't have a E320 but it sounds like the same system as the 190. yes, using ramps help big time in removing the belly pan, or jacking up one side of the car. since the drain plug is in the front, you will not drain all the oil. as for the oil filter wrench. i got mine from target or autozone, just take the new filter to one of those places and they have a selection of different filter wrenches that plugs into the 3/8 inch socket. i think i paid something like $4 for it. But if you start doing the changes yourself, chances are you won't need a wrench as you can hand loosen it. its the first change that's the problem. Ken

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Ken
87 190E2.6