Does anyone have an Opinion on Marvel Mystery Oil? When I bought my VX from a gentleman down in Houston, he made a suggestion that I used this in my gas tank. I personally have never heard of it. I did find it at Pep Boys for about $12.00 a gallon. He said he uses 4 oz. for every tank full. The directions on the bottle suggest 4 oz. for every 10 gallons of gas or 8 oz. All opions would be welcomed. Thanks