I need to ask a newbie question because I'm deployed right now and can't pick up the phone to call my local stealer. My truck has 11,000 miles on it, and I have have no idea when the last oil change was done since I bought it used. When I get back, I plan to change it to mobile 1 synthetic because there is a Mobile 1 shop close to where I live that you can drive in and it's really convenient. I don't know what weight oil I should put it in though. It's a 4.7L Thanks in advance.