The large orings that come with the purolator (cheap) and wix(expensive) both don't fit nicely. to the point that I had to hold the oring on while I reinstalled the cannister lid. I recently bought two Mann Filters from Phil and the orings that came with that filter fit snugly and the seal is perfect.

Oh and by they way...make sure that the lid is facing the correct direction. I installed it backwards once while I was in a hurry. Yeah, no seal if its on backwards in my case.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg