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One of the reasons why a valve burns out is constant driving on a lean mixture. And here we are talking mainly about engines with conventional injection, because engines with direct injection are designed to drive on lean and super-lean mixtures. If the engine constantly operates in this mode, the valve will burn out pretty soon. Valve burnout can be in the form when the valve itself burns out and cracks, or it can be that the valve seats, the so-called seats, burn out.