So, I just bought a used 2006 Element with 52k miles on it. The guy I bought it from has been putting Mobile 1 oil in it the whole time past the "break in" period. I am just wondering if there is much difference between Mobile 1 and Valvoline's full synthetic oil? In my town, there isn't a quick place to get an oil change with Mobile 1, but there is a Valvoline quick lube. Should I stick with the Mobile 1 and just deal with the "non-quick" lube?