TCP/Marvel Mystery Oil

[40m]

What might be being used in the 340 either in the fuel and or in the oil? Of course your answers will be coming from a friend.
My friend for instance is contemplating a few ounces in the oil a couple hours before an oil change as well as in the 100LL used exclusively.

[aeroaddict]

And what would your friend say are the advantages of doing this? Just curious.

[40m]

And what would your friend say are the advantages of doing this? Just curious.

TCP is approved with all sorts of promo and testimonials available on line. MMO not approved touted as snake oil by some and having benefits internally as well as the top end by others. Me I'm just a curious kinda guy

[Dan L]

I’ve used MMO in my fuel. I like to think it keeps the engine cleaner and helps with valve issues.

I may have friends that do the same.....