I have the oil filter tool, as it's cheap (>$20) and works really well. Try to remove the filter without bending the small wiring harness right above it. It's a bit of a trick, but easy with practice.
The tool I bought required a 22mm socket, and my set didn't have one, so I bought one too.
It's possible to remove the filter without it, even by hand if your grip strength is up to it, but like the tool.
The dealer looked at me like I was nuts when I bought it. "You own oil changes? Are you nuts, man? It's a Mercedes! No one works on their late model Mercedes themselves..."
1998 C230 "Black Betty"