I have about 1500 miles on the original oil and am planning a trip for this weekend. It will be a total of about 1500 miles, from NJ to Kentucky, and return. The owners manual says to use 5w-30 SM oil, and after reading some good things about the GC 0w-30, I was considering it for this and future oil changes. What do you recommend? Should I change the oil before or after the trip and which oil should be good for this engine? Thanks.