So yesterday I bought a new Honda 50 HP (gave a deposit) and it never dawned on me that my built in gas tank in my 16 Sylvan (18 gallon Mueller) has a 50:1 oil mix in there. The Honda is 4 stroke and doesnt mix oil with gas. Now I realize I can syphon the gas out but wont the oil residue left in the tank mess up the new 4 stroke or will it be diluted so much it wont matter? I am really nervous about this as I think replacing the tank would be a giant hassle. What should I do? Thanks Bob