Just picked up a '07 Accord with about 40k miles on it. Cap says to use 5w-20 oil, which I kind of figured from the start. I'm looking to run a synthetic b/c I plan on keeping the car long term and bought it used... so a bit of a insurance policy. Mobil 1, Pennzoil Platinum? any real difference? Also, do they make a 0w-20 that I could run??? Or is that to thin. Location is central FL; aka HOT AS Heck.