I'm thinking about switching to either Amzoil or Opti-1. For those of you that have tried both, which do you prefer? My dealer gave me a bottle of Amzoil today. It is 8oz, and it says to mix with 6 gallons for the 100:1 ration. That seems really lean. Do you mix yours that way? Also, the dealer asked for some feedback on the oil since they just started carrying it. Will I notice any difference over the course of just a few tanks? Hope you all have a great weekend.