Hello all, new user here. I am the proud owner of an 03 Jeep Wrangler Sport with the 4.0 engine. I bought it new and have always used 10w30 Valvoline in it since its first OC. The manual calls for 10w30 motor oil that meets the the requirements of Chrystler MS6395. Valvoline meets this requirement and I run STP oil filters. It has no leaks but just turned 108,000 miles. Is the high mileage oil worth it or should I keep feeding it the Valvoline white bottle without concern? Average 10,500 - 11,000 miles yearly mostly highway miles. I live in the Midwest so the temps vary from below freezing to fry an egg on the sidewalk lol