i'm no tech but it seem like no problem to me. take off your oil cap and rev the engine up. drops of oil will splatter everywere. also, when the oil heats up it will cause condensation just like boiling water. as long as thier is not a pool of oil dripping into your filter housing i doubt you have a problem.
good luck,
adam

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320