Hey guys, just bought a new 5.0 F150. The engine is spec'd to run 5w20, but I do tow on occasion & drive "spirited" on occasion also. I was thinking of going with a 5w30 full synthetic like Pennzoil Platinum 5w30 instead of the 5w20. I'm guessing the 5w30 will be fine, since the same 5.0 engine in the Mustang track Pack is spec'd for 5w50 oil, & the regular GT Mustang is spec'd for 5w20 oil. I asked a Ford Engineer about this, & he stated there is no physical difference in the Mustang 5.0 or the F150 5.0, except for engine strategy & camshafts. He said the 5w50 for the Track Pack is spec'd because of the "abuse" that engine will see. He also told me that running a 5w30 vs a 5w20 would yield no difference in MPG to the average driver, but would add "a little" more wear protection, but at the nano level. So I'm guessing my question to you guys is, has anybody here run the 5w30 vs 5w20 in their 5.0 vehicles ? What oil besides the Pennzoil Platinum would you recommend ? Last question, my vehicle has 300 miles on it, how early do you guys drop your factory fill & go to whatever oil you're gonna run (500 miles, 1000 miles) ?