Hello All, I have a 98 Ford F150 with the 4.6 v8 motor. The truck has 45k miles on it, and has received regular dino oil changes (at the local quaker state station, ugh) Anyway, I got the truck a few months ago, and I did my first oil change on it, and went to Mobil1 5w30 with motorcraft oil filters. I think that this is a good combo for my truck. I change the oil every 4k. Now, I am starting to think (is the mobil1 really worth the dough) The truck takes 6 quarts. I pay 19 dollars for a 5 quart jug at walmart, plus 4 and change for an additional quart, plus 3 bucks for a motorcraft filter. This comes to a hare under 30 bucks in supplies alone. I take it to my buddy who works at a local mom and pop oil change place, and throw him 10 bucks to change it with my oil and my filter and lube the chassis (small price to pay to keep you hands clean, lol) Anyway, I have read alot about the 5w20 motorcraft oil for 1.44 a quart at walmart. Here are my questions. I really don't want to run a 5w20 weight oil in the v8. I like the 5w30 more. I beleive that ford did this to improve gas mileage, and I'm more interested in protection. Is the motorcraft 5w30 a semi synthetic oil? How does it stack up against the mobil 1? At, 1.44 a quart my oil change goes from a 40 dollar oil change (with 10 dollar fee) to a 22 dollar oil change (with 10 dollar fee), and I can't really justify the mobil1 in a stock motor like this one. Comments please... Thanks.