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Looks like this May have been a mess of previous stop leak and dirt from the past as Jeff said. I think the foaming aspect May have been from ... Only thing that comes to mind is a blown head gasket, though usually you lose coolant. One other thing might be a worn out, ready to replace ... Yup. Oil pressure is 80+ psi, water pressure 15 psi max. So... generally when there's a breach between the oil gallery and the coolant passages ... Over 12 week blackish SOOT build up in Coolant tank no diesel smell, coolant loss 100 ml coolant Clean. DPF burn temp okay data log engine temp okay Elevate your machining game with Black Gold Coolant Rings. Explore precision-engineered rings designed to enhance coolant flow and tool performance. The coolant is starting to turn from BMW blue to black. In the past as the coolant has deteriorated it's turned more of an orange color. so for the past 2 years black spots keep appearing on the coolant tank walls, the coolant itself is crystal clear there is no oily residue ... The new fluid was orange, but now after just 2k this fluid looks black as well...why the heck does the coolant change color so fast? Black in the coolant is not a good sign . Would say as above,, oil from the engine,, or the auto box is mixing with your coolant.Some auto boxes ... The coolant reservoir tank's clear tube to view volume level is not so clear, so I cannot see the level of the coolant in the tank.