somewhere down the line I'm sure the scrupulous mechanics have somehow convinced the foreigners that their scooters require an oil change every 500km ! you see some adds even saying they changed the oil every 300km all the way to Hanoi ! normally the oil change on a scoot is every 2000km I think...so any scooter purchased in HCMC with a new oil change is enough to make it to Hanoi with plenty of detours along the way. Please correct me if I am wrong