Maybe I have over researched to where I am now totally confused which oil to use in my 2008 model. Found a site that said Mobile 1 Formula M 5-W40. I live in deep east Texas with a pretty hot climate. I will be driving mostly to work and back 6 miles one way and no interstate driving. When I called O'rileys to check on that oil they could not find it and said their book called for a 5-W30 or 0-W30. What should I use? I have 85,000 miles on it now. Also what is the best oil filter and part number? When I started looking that up it opened up another can of worms!!