I have 6 gallons of old 50:1 mix in my garage that I dare not put in my outboard. Any harm in running it through my 8hp Briggs riding lawnmower? How about running it through my 2 cycle weed whacker (instead of the special oil for it)? If not to either or both questions - why?<br /><br />I thought I remember reading somewhere that this was a no-no but am caught in a "senior moment" now.