非常感谢各位的热心回答。我也上网查了一下。SUBARU车：1st oil change：

1st oil change 
all models- 6 months or 6,000 miles, whichever comes first.
Its ok to change early, especially with hard driving, cold/hot weather, or manual transmissions that are revved up or downshifted. Its up to the individual owner

http://www.cars101.com/subaru/maintenance-2016.html

我的车刚开了个3月和3000km（=2000ml）。如果我下个星期的长途开6000km。总共有9000km里程，正好快到6000 miles (=9600km), 回来后也正好换油。再次谢谢各位热心的朋友。