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  1. 2014-2018 Mazda 3 Skyactiv Engine and Performance
    Hey everyone this afternoon I felt like checking out my intake valves for carbon and soot buildup as I hand scrubbed them 10,000 miles ago at 50k (you can find these images on page 2). I was pretty surprised to see a moderate amount of carbon build up on the right most valves and quite a bit of...
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