Always look on the back at the API/SAE ratings to see what you're getting. The Truck & SUV was originally a "consumer" packaging of Mobil Delvac-1, the synthetic diesel motor oil, but was recently changed to just a different multigrade formulation.

What weight and grade you run should be determined by your environmental conditions and driving style. Most lubricant web sites, including www.mobil1.com, will have an online assistant application to help you decide if what's in the owner's manual is a little too cryptic.