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2012 Kia Optima Sx 22k mi. First startup and warm up were ok, idled fine after oil change. An hour later I floor it getting on the highway and things go very wrong. Oil broke down so incredibly fast it caused fuel soak which in turn caused misfiring on several cylinders. 3 newer spark plugs (>5k mi) immediately shattered the ceramic inside the cylinders. This destroys everything in its path. I now have burnt rings, bent exhaust valves and a turbo that won't boost on a relatively new, previously problem free engine. Not happy at all.