I just bought a new Frontier. The owner's manual says the oil should be changed every 5,000 miles or 6 months. I have no problem with the 5,000 mile requirement, but this will be a low mileage truck and it will not be driven on short trips. If I change the oil every 6 months, I will only have 1500-2500 miles on the oil, and modern oils can easily go a year or more with no problems. I don't want to void the warranty. Should I go ahead and change the oil every 6 months regardless of how few miles I have driven? Thanks!