I've been led to believe that MB doesn't actually make their own filters (like they don't make their "own" brake pads) but use Mann, Hengst & Bosch production.
I've been told they are pretty much interchangeable, but could certainly be wrong. I bet a search would find a discussion or two.
Delo's great stuff. It is my personal belief that any of the Fleet (S?/C?) type oils in 15W-40 provide tremendous protection & cleaning in gas engines. Not necessarily for those extra long "extended drain" intervals, though. That's where 100%Synthetics and oil analysis come in. I go 5K miles betwen changes. Oil's cheap: MB parts are NOT!
'91 420 SEL @ 199K, '92 SVX @ 181K, '93 SC400 @ 86K, '93 Kaw ZX-11 @ 30K, '87 F250 @ 181K , 2001 Valkyrie Interstate @ 6K, Y2K Honda NightHawk 250 with 1.5K, '88 420SEL I.@ 179K & the 2nd latest, an '88 420SEL II.@ 210K runnin' parts car, '85 F150 300/NP435