When I was last there, the silver container was partially filled, so I didn't buy it. One problem that I have found at Wally World is that people will open containers and fill the one they are purchasing to the very top and leave the partial one on the shelf... at least at the one that I go to. I use the white container and just put it in with the tractor fill up. If you purchase the 3 quart size, it will treat 300 gallons. I believe that it will disperse in the fuel without agitation after a few hours. It is a petroleum based product, so they should mix quickly. For the small difference, I will be trying the silver bottle next time. The price difference was under a $1.00 for the 3 quarts. Junk......