Will some more experience & qualified (not a negative reference to RobEngineer!) MB W126 owners/mechanics PLEASE respond to my specific inquiry re: "am I just being just too anal-retentive?"???

I really am torn with the concept since make-up oil is really rather cheap when you just throw in a partial quart in a 10K interval, but if it something I really ought to repair then I want to do it.

Thanks!

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'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