Interesting results!

I think I need a new fan clutch as my fan rotates for a good 8 seconds after the engine is switched off. Might as well do a system flush like you did, hope to get similar results.

Thanks for sharing them.

P.S. I recently changed my differential oil (300E) at about 210,000 miles, the old fluid was golden in color, seemed brand new. I have no recollection of it ever being changed in the life of the car though. Eh, whatever, it is done now!

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)