Yup, I got the suggestion in another thread related to my stem seal thread, to add a quart of ATF to the engine oil as a way to speed up the cleaning of the gunk that was present. I should have thought otherwise of it.

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03 CLK430 Cabrio 211K Pweter Silver/ Oyster Leather
90 300SEL 214k Pearl Black/ Alto Grey/Black Leather

Prior: 85 190E, 88 300TE, 89 300TE, 90 300E 2.6, 90 300TE, 92 300E 2.6, 91 and 93 300SL, 87 Ferrari Mondial Cabrio