I just used the second cycle, ZAO 0W30. I haven't used good oil before, which is the so-called Subaru original barrel oil, 5W30. I feel that AZO is more flexible, and the fuel consumption of long-distance driving is obviously reduced, but the reduction rate is 0. X per 100 kilometers, x is less than 3. First replacement at 7500 km. After replacement, it was found that the newly changed oil was not as comfortable as the oil at 7500 km. In short, this oil is very suitable for family use, and students with violent tendencies should forget it.