I'm new to the forum, so I apologize if I don't know all the lingo. I have a 2007 Ford F150 V8 4.6L. I have always had the oil changed with 5W20 at Wally World. I am now going to start changing my own oil and am wondering if 5W30 would be better since I live in the Texas heat. Also, is regular yellow bottle Penzoil the way to go? I have 32,000 miles on it and drive about 60% highway and 40% city. Thanks!