I use Bi-Tron in motor & box http://www.bitron-liquidgold.com/ Not cheap but really works, I havent used the fuel conditioner, I couldnt find any reference to octane so wasnt willing to use it in case it was illegal.
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Remember....... Tim the toolman Taylor says " If you didn't build it yourself, It isn't yours".
I used to sell the LUCAS OIL range of products. The do oil & fuel treatments & I have found them to be excellent. Although I no longer sell them, I still buy them for my own use. Check out www.lucasoil.com