Hello Ethan. Actually, I'm not sure where the filter is :-). I'm trying to figure it out. I haven't crawled under the car yet to see if it's under the car. My C230K has a 1.8L supercharged engine, I believe the C240 has a six banger, but could be mistaken. So, the location of the oil filter may differ. When I asked my service advisor, he scratched his head and said, 'Uh, I think that the oil filter is under the car.' My ML430 has the filter on top, which makes it very convenient to change oil filter oneself. I'm still trying to figure out how to pull the top engine cover to keep it clean there. They are building in my neighborhood and I have to drive through a sand storm sometimes. -Norm