Just got my first UOA for my 2018 F150 with the 3.5EB. I've been using Pennzoil Ultra Platinum 5W-30 starting with the first oil change. The truck doesn't see a lot of miles, but I change the oil frequently. The report was good, but I'm a bit concerned because it came back showing the viscosity was more like 5W-20. Is there another oil that's good for the 3.5EB and is know to hold its viscosity? Most driving is normal day to day stuff, but we do tow our 6,000 travel trailer occasionally.