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I change my oil every 3-4K miles as well, I drive my M6 hard every now and then and by 3k miles the oil is black. I just recently switched over from the original twin turbo BMW oil to 5w-40 Liquid Molly. So far I like how it doesn't burn as fast as the BMW Oil. I would always have to add a qt when I would get close to 3k. I was told this is normal, I have yet had this issue while running liquid Molly.
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