Good day all- I will, hopefully soon, be receiving my brand-new 2009 F-150 with the 5.4L flex-fuel motor. I'm in a bit of a dilemma on what oil to run. Driving conditions: - I'm a volunteer firefighter. The truck will get run hard at times and will idle a fair amount. - I live in north Texas and work in the metroplex, so I get the fun of stop-and-go driving in 110F weather. My requirements: - No extended OCI. I'll change the oil every 5K as the book says. - Ford-recommended weight only - 5W20. - One oil year-round. - This will be a high mileage vehicle. I drive about 35K a year and hope to keep the truck 5 years. - No Amsoil. - Oil changes will be performed by a local facility that I trust. I'll provide my own oil and Motorcraft filter. I've run Mobil 1 in the past and been quite satisfied with it, but as we all know, it's expensive, and I feel it may be "too good" for my application. I've also run a couple vehicles with the Motorcraft 5W20 synthetic blend, which seems to have lots of positive reviews here on the forum and is considerably cheaper. What say you? Stick with the M1 I've used in the past? Go back to the MC syn blend? Something else entirely? Other comments? Thanks in advance.