is this a good oil? a friend of mine wants to run it in his '04 titan, 69,000 miles. he uses to tow a fifth wheel camper with his truck, but now he has an F-250 so he only uses this truck for very short trips to and from work. 10 miles round trip. i was thinking synthetic would hold up better to fuel dilution, and the 10W30 would be less prone to viscosity shearing. would change it every 3-4k with a P1 filter.