Well, I stocked up good on the Chevron Supreme 5W-30 Sunday. Now I have a question for you fellow oil gurus. Does Chevron market a synthetic blend oil? If so, where is my best bet to find it? I didn't notice it at Walmart, but they were low on their oil stock that day. I wouldn't mind paying extra. I was reading on here that 5W-30 shears down to a 20 weight over time, like any other dino oil I suppose. A synthetic blend Chevron or Havoline would be nice to have!