I have an 05 focus st with the 2.3 with 86000 miles. I've been using QS ultimate duribility 5w20 for a few changes. I've been wondering about M1 0w20 and edge 0w20 which the 0w20's seem to be showing up more at wally world. I don't understand all the [censored] on the product data sheets so i ask you guys. School me on why i should use a 0w20. Is it just cold start performance in really cold conditions?