Part 1 If this has been done before I apologise for the duplication. I bought my C240 a few weeks ago and while it has a service history and the oil was changed about 2000 miles ago it was well over a year ago. So. oil change time. You're going to need, oil, an oil filter, an oil filter wrench and I'm using the vacuum method so we have a vacuum extractor. Right. Let's get started. Park the car on a level surface and open the bonnet. (Always a good start for maintenance.) Gently tug the corners of the engine cover upwards and it'll detach. The bits we're interested in are shown here. First things first. Remove and wipe the dipstick and lay it down beside the vacuum pump probe. Mark the length of the dipstick on the probe with some tape. More later. Insert the probe in the dipstick hole. Make sure the tape disappears. You'll hear/feel a good "thunk" when you're at the bottom of the sump. Remove the oil filler cap. Pump the vacuum pump about 20 times. Oil will flow! About every litre (see marks/bands on pump vessel) pump about 20 times again. You can leave the pump to do its thang and get on with other stuff. Use your strap wrench to loosen the oil filter housing. Place a rag round the top and remove. Place the oil filter assembly in a basin to drain. Now is a good time for a cup of tea.