I keep my gallon jugs and buy from Action Marine in La Conner. Can't remember the price off hand, but I believe it saves me around $4 a gallon that way. I run XD-100 on my 150 ETEC and have the 5 year warranty. I will never put anything through my motor other than the Evinrude XD-100, it is proven and why change to save $3-4 on a gallon when I have invested $13,000 on the motor. I have my motor set on the XD-100 setting and go through 2 gallons of so a year averaging 120-150 hours. Kind of like cheap insurance. Save the AMSOIL for 4 strokes and tow vehicles.