I've never taken those cooler lines loose unless I was making a major repair.

My oil and filter gets changed simultaneously at 5,000 miles. Take the plug out of the drain pan, collect oil. Take filter canister lid off, replace filter, put finger full of clean oil on the rubber o-ring and sealing surfaces of the new filter. Re-close canister, go under and put the plug back, refill. Done.

Cooler and lines don't hold enough to worry about. Yes, it's enough to blacken the new oil instantly, but that doesn't really matter.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL