Mobil One has fallen out of favor across many venues. They make decent oils but are not as good as they used to be.

I read this guy's findings when choosing oil. He runs pressure tests on a wide range of oils, to the point of scarred metal,. Some of his rhetoric can be off-putting but it's hard to find objective oil tests out there. Each manuf will tout their oil as the best, yada yada. There are a whole bunch of gimmicks out there, such as "Castrol Edge with Fluid Titanium Technology".... sounds great right? It ranks 104 on his list.

If you want to skip a lot of reading and jump to the results, press CTL-F and search for "begins here" However, scroll up from there a short bit and read his ranking system first. You can also press CTL-F and search for your current oil to see how it ranks. Overall for the price, QSUD is the best rated at an affordable price.