Wanna see something interesting?
Click on FastLane and find the oil filter for an 88 420SE (Not sure what year your 420 is). Fastlane carries 2 filters, Hengst (which is OEM) and Bosch (which is not OEM). Even in those tiny pictures, you can see a difference.
Is the difference significant? I dunno, but for basically the same price, I would go with the OEM.
But then, your mind was already made up that Wix is supreme, even before you asked the initial question, so why waste the bandwidth arguing about it?
2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg
And remember folks, Only You Can Prevent Hilliary.