Hi guys! I have a new-to-me '99 Cherokee with the 4.0 and it has about 55,000 miles. I plan to use Maxlife 10w-30. I've read about others using Rotella T 5w-40, but its mainly a short trip vehicle, so I think I'm better off it stick with a 10w-30. I plan on using the 5.0 Mustang oil filter, so...