Engine ever, and admitted failure from Mazda. Instaed of going with what works they still are redesigning it making it worse. Moving the exhaust to the top, intake on the bottom and changing the way the engine rotates is suppose to make it better, lol. Smh.....we'll see how it goes. Fix how far the apex seals sits out of the apex seal groove If you wanna fix something. Lower the regulated temps on oil and coolant. Put a big ass sticker that says no synthetic oil, lol.