Hello dear people! I looked at the oil of my Mazda 323 yesterday and found small silver and black particles in the oil. I then screwed down the valve cover and it was totally soaked with pitch black grit, so several millimeters thick, I guess. Partially 5 millimeters thick and more. I think this is condensed oil. I touched it at a particularly thick place, and I had stone-hard little crumbs in my hand. Like hard coal the feeling has t. The area in which the connecting rods and the plumbing springs are were also black, but not so thick. On the inner wall of the cylinder head were also stone-hard black crumbs. I think that these small “coal stones” get into the oil cycle and are rubbed between the engine parts. And then small metal chips are sanded off. I think that’s why I found small black and silver particles in the engine oil. The engine oil was also quite dark brown, although I first saw it. My question: How bad is that? Is it enough if I continue driving the engine and keep changing the oil about every 3 weeks? I drive to the metro, where I can suck the oil free of charge. I pour half a litre of 50 % 15W40 and 50 % diesel in the engine and let the short chucker. Then I suck the oil off. Then I fill 3.3 liters 15W40 in the engine and leave the short tuckern Then I suck off the oil again and then I fill in 3 liters 5W40. And I drive with it again. Can the oil deposits in the engine oil dissolve in the course of time so sufficient that no silver metal splinters are rubbed out of the engine parts anymore? Should I remove the black grit from the valve cover? Should I also try to clean the area with the connecting rods and valve springs? Should I also remove the oil pan and the black grit, which is probably can’t you drive the engine for a long time? Or is it already too late? I bought a valve spy or a probe lesson and tried yesterday to control the hydros. Unfortunately, I didn’t know how to do it. In advance, thank you very much for your answers, Walter.