phillipj, recommend buying the proper filter canister 'socket' from your local MB dealer. As mentioned the O-rings replace the old ones on the shaft. Use a pick to remove the old ones, then lubricate the new ones with some oil to make installation easier.

A suction device makes oil changes much simpler because there is no need to get under the vehicle. Griot's Garage sells a quality Liquid/Oil Extractor which I have been using for the past 12 years to change oil in our MB automobiles.

Despite the FSS I still change oil (Mobil 1) and filter every 7,500 miles.

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Fred Hoelzle