HavasuDreamin: Contact Chuck Goodman at Hydro Dynamics (318) 965-0201 He is the "Man" when it comes to the bottle. Tell Him you would like some information about the stuff .They have a very informative booklet that answers many questions . 2 strokes are totally different than a system that you see for your typical big block.I have never used it. I'am in the process of installing the system. Give him a call ! I'll let you know what I think after some use. It's still winter in Maryland, at least a month before I get in the water.