Any benefits to using Marvel Mystery Oil as a fuel additive every so often? I know it works really well on my zero turn mower as a fuel additive. My concern is the crappy gas you end up having to get some places and I want to keep the internals clean and in great shape.

 

I would recommend Chevron Techron added to your fuel every three months.

 

No, its a direct injection, so intake valves are not in the fuel path.
Techron, sure, but top tier pump gas has enough addatives.