Did you just spin it on? Or did you tighten the bolt from the top too? I don't have the torque spec in front of me, but I had to really crank down on the bolt to get the wrench to click.

On my 240, I filled the new filter with ATF, a thin film on the rubber gasket, spun it on, then tightend and torqued it down, never had a leak.

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2000 C230 Kompressor "Frosty"

2007 PT Cruiser
2001 VW TDI Beetle
1999 Landrover Discovery II
1971 Corvette

Gone: 97 Cabrio, 83 240D, 93 VW Eurovan, 95 Volvo 850, 93 Chevy Astro Van, 77 VW Bus, 99 VW Jetta, 74 VW Bus