Its about time for another oil change and i do not know which oil to go with. I usually go with mobil 1 15w-50 but now everywhere i go only has 5w-50, what difference will going with the 5w-50 make? Is it too thin. I have also read that rotella 15w-50 is good and cheap which sounds good to me but i have also read that it is not good. Any input on the subject would be awesome. Thanks guys.