I've heard the hype. Where can I find this stuff? Is it readily available? I'm in San Diego. I have a 04' G35 Coupe which i've heard likes a little thicker oil. I've been using M1 5-30 for the life of the car. I have two 5 qt jugs and am willing to trade someone locally for Green Castrol. Should I switch, or add a quart of 0w-40 (hard to find) to my mix?