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Recently bought a 2017 ford explorer with 2.3 ecoboost with 90k miles in south korea. Ive had it for 3 weeks now, and started hearing a bit of a noise. Looked inside the oil fill port and i believe thats the cam shaft and it has visible wear. Does anyone know what this means, what the possible culprit is? Its still under warranty for about 1 more week so id like to figure it out as soon as possible thanks!