As Carl pointed out it would be difficult to design a one piece gasket that worked better than the standard 4 piece gasket set for the oil pan. For example, the front and back curved areas require a much thicker gasket than the longer flat side pieces. I am a fan of the Right Stuff but I have two cautionary notes about using it in this application. First, the clearance between the oil dippers and troughs in the oil pan would affected by the absence of gasket material. I am not saying that it would necessarily matter but I would want to get an opinion from the experts and it would probably vary from engine to engine depending on how well aligned they are in the first place. Second, while we don't plan on removing the oil pan for routine maintenance the adhesive qualities of the Right Stuff will make it very difficult to remove the pan. You may end up warping it to pry it off. The Right Stuff is used by some manufacturers as oil pan sealant (Cat engines) so I know it will seal.
I have used the Right Stuff along with a standard gasket on certain applications with good success. If you need to disassemble, it is not too hard to shear the gasket in the middle, then it is not too bad of a job to scrape the gasket material away. Again, I would only use the Right Stuff alone where it would be doubtful you will ever be there again.
Good luck and let us know if you find a one piece gasket for the oil pan.
Kent
