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I have another post about my car smoking but at first i was thinking the smoking come from bad turbo seal but now i suspected is the oil Control seal, because the way the spark plugs look. I only premix not omp.
Leading spark plug
Looks like any case of oil control ring (PN:N3Z1-11-S10A, 0820-11-341, 1202-11-343) failure I've ever seen. It's probably time for a rebuild. Sorry buddy.