Last night I picked up a Topsider pump/canister oil extractor tool from a local boat supply store. Just like the one in the DIY post. What an awesome way to change oil!

Anyway, have a question. The M-B filter kit comes with 4 rubber o-rings to replace existing ones. I am confused about the largest one. Does it go into the little "void" 4-6mm below the bottom of the oil cap, or is it used as the seal between the plastic oil cap and the metal housing used to screw the oil cap into?

Thanks in advance!
George

'99 C43 AMG
'01 Topsider

The largest rubber o-ring is used to seal between the cap and the metal housing. You should see the old gasket on the cap if you have not removed it yet.

Remember to only torque the cap to I think 25 lbs., if I remember correctly.

Thanks Benz75! That's what I thought, but wasn't sure. And your recollection is correct on the 25nm.

Thanks again.
George