MMO Piston Soak???
 

Has anyone hear done a Marvel Mystery Oil piston soak...where you pull your plugs and our in 2-3 oz of MMO and let soak overnight...and then reinstall plugs, crank it up and run it...It is like a Seafoam treatment..but it is suppose to really clean the pistons..and all the other stuff in there:D. Would these truck engines benefit from this?