Date registered: Mar 2005
Location: Georgia, USA
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RE: E500 Oil Change Concerns
lear31a driver, I wouldn't worry about the suction method. The car is designed to have the oil sucked out. I do my own oil changes. The oil pan and the dipstick tube are designed for this.
Do a search on this topic in this and other MB forums. I remember reading posts about someone doing the suction method versus the drain method and measuring how much oil was removed; they were very close (if anything, the suction method removed more oil). I believe the suction method would likely remove slightly more oil based on my observations of the oil pan shape.
I do the drain method because I like getting under the car, not because I think I can get any more oil out of the car.
It is simple economics. If they are only going to do an oil change, they can suck out the oil and change the oil filter all from the top. If you are going to have a "B" service done on the car, the car is placed on the lift and the oil drained out (the mechanic doesn't have to chase down the suction machine).
See my post about the used oil analysis done at approximately 12,000 miles and you will also see that Mercedes long drain intervals also are not crazy recommendations.