Originally Posted by
GraphiteGhost
If you do not have one, download the Owners Manual & Service Manual here (FREE) on the website document collection. Read and understand the owners manual, it'll help with many questions you will have. It will be a VERY expensive move if you take your car to a Chrysler Dealership (read a lot of posts here, Chrysler will charge you a lot and may not fix your car) you'll have to research the manuals and if beyond your abilities then look up a reputable Mercedes Benz European mechanic familiar with a 2003 (ish) MB SLK-320. The users manual (and when needed), the service manual can help you understand the car. There are MANY MANY self-help posts also in this free document collection, to help do simple tasks and maintenance on your car. Good luck, many members can help with good reliable information on any trouble you may have.
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I use a Mityvac to pump out the oil from the top and replace filter. When the Mityvac starts pumping air and I give it a few more pumps, it's usually right or slightly below the 8 quarts mark on the bottle. That is good enough for me. Don't want to take the chance to strip the oil release bolt.
Also, even if a little oil is left over, I do oil changes often so the "old" oil will circulate and be sucked out with the next oil change. It's a simple process, very clean and fast. Takes about 30 mins in total with the longest part being the replacement of the 5 oil filter O-Rings.
But yeah, 8 quarts seems to be the magical number.