i work in the petrol industry and if you have water in fuel ((a lot )) not just you think there mightb be some then add,s are ok, or if setting all winter if you choose not to drain tank and carb.s then a stabilizer is ok. and if ya just gotta use it then put the whole can in. a drop or two is just waisting your time. also if carb,s are gummed up and you think this stuff is gonna help,, well just keep on buying cause i need the overtime and the mechanic you,re gonna take it to needs the work,, just my humble opinion