Rotella 15w-40 is great if you like a oil that is way lower then others in TBN, pour point that means you will need a block heater in some cold areas. This 15w-40 is low in VI and high in ASH levels (great for turbos)..I can keep going..
Since I also live down here, Rotella is like NASCAR down south...It is great a oil (at Wlamart) sure, but compared to others, it is worth the $15 to %19 beans.
Would I use it, NO! the stuff is too thick for me and there are better oils. Why? Test a few and post it since the data on this forum is lacking.....