My EF3000iSE generator used . Been used 3 hours by former owner. I used EF for 6 hours and I have clean oil leaking under generator inside case on steel case floor. Tthe dip stick was tight no sign of oil on side of dip stick or rubber gasket. Oil plug was tight...But oil is leaking..somewhere. Is there another place I should check for leaking oil. I have no warrenty on it. Other than that the EF3000iSE runs great..PLEASE HELP..I can take the shell apart at battery compartment to check while running?