I just bought a new Mazda 3 Skyactive with the direct injected engine. I know that there have been issues with carboned up valves with some DI engines. I have been using M1 in all my stuff with good results but I have noticed some carbon accumulation as a result of burnt oil with the M1. So should I continue to use the group 3 M1 or should I step up to group 4 or 5 oils? Is there a benefit or is it marketing hype? If I do abandon M1, what would be a good alternative that I can preferably get at Walmart? I don't want to get into a discussion about why Mazda sucks or why DI engines are the end of the world. I bought the thing so I have to live with it now.
Thanks
Perry
Thanks
Perry
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