Read thru the thread and have a question. From the looks of the website they deal in mostly 2 cycle stuff, Now what would be the possibilty that they put some mixed gas in the tank. Would smoke like heck. before i did anything, I would simply check the gas and see if it is plain gas or mixed. If In doubt, run the mower until tank is dry and refill with gas. The oil mixed in the gas wouldnt hurt anything, except the mo-skee-toes. If it is/was mixed gas, the smokeing would clear up once the mixed gas is gone.