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Does anyone have experience with using fuel additives in the L67 engines (SSEi)?

I've always used Marvel Mystery Oil, however, I'm concerned about it's effects on the SC.

I have never used MMO in a fuel injected car but I use it all the time in my plane.

I use about 4 oz in the gas tanks to keep the valve guides lubricated. I know of a floatplane business nearby with 6 Beavers and since they have been adding MMO to their gas the incidence of valve guide failure has dropped by 75%.

Now, since modern car engines have absolutely no relationship with 40 year old aircraft engines, you can see that this post is useless.

There's not going to be any effect on the S/C as the fuel is introduced after the S/C, in the Lower intake Manifold, about 2 inches before the Intake valve area of the head