Hi, I'm new to this forum, in fact, is my first post, I think this forum does not have a search engine, so I make this question, which has done much but I have no response yet that satisfies my concerns, there is: What kind of motor oil should I use on a truck Ford F150, FX4, 2007, 5.4 L, 3V? . Many speak of Motorcraft 5W20, but I've read experiences in various forums and publications that it is better to go to a 5W30, 5W40 and even to what is the reality of this matter. I live in Venezuela and the ambient temperature is an average of 22 to 24 degrees Celsius throughout the year, ie on the day we have 34 degrees and 22 degrees Celsius at night. Thanks in advance.