I had a Buick GNX that I put over 130K miles on in a short period of time as I drove it from Great Lakes Illinois to San Diego round trip many times plus trips to Florida etc. The car had the original V6 turbo and had never been opened over its entire life. Castrol GTX was the life blood that kept that car going and going. My Challenger will get GTX on its first oil change and then on for ever.