Well, I have solved my road trip delimas. All I do is highway driving and I will be taking a road trip at the end of the summer. I can use the Mobil 1 Extended Performance 15w50 for a good part of the summer and for the road trip. I used that PepBoys Coupon. 3 quarts for 19.59. I like that. They don't sell 0w40 or 5w40. I was thinking this may be a little thick but it's on the low end of the 50wt scale and I will be driving through 110 degree deserts and climbing hills with 3 other peeps and cargo. I won't run it for 15,000 miles. I'll probably dump it at 7,500 miles but incase I go over, I know I won't be hurting the engine.