HELLO, THE USE OF EXTRA OIL NEVER SOUNDS TO GOOD. I LOOKED IN MY HONDA 400 MANUEL FOR ANY HINTS ABOUT NOISE OR OIL CONSUMPTION AND FOUND NOTHING. I JUST BOUGHT MY CM400T AND IT HAS OVER 30,000 MILES AND SHE RUNS STONG. I´VE HEARD GOOD THINGS OF THAT MYSTRY OIL STUFF. I DON´T REMEMBER THE FULL NAME. READ THE INSTRUCTIONS AND SEE IF IT WON´T HELP WITH THE NOISE. LET ME KNOW HOW YA DO. THANKS, DAVID A.