這是老外貼的帖:

Long Drain Intervals in a BMW
I have a BMW 325iC convertible. BMW recommends oil changes at very long intervals – 15,000 miles using synthetic motor oil. Do you agree that this is adequate for Southern California’s combined stop-and-go and freeway driving?




所以, 看你用甚麼車配甚麼油,
我是照機油廠給的數據換油, 因為是礦物油所以8k km 換一次.

AECA 合成油搭雙B ,1萬miles(全合成) 至 1萬5miles(longlife)換油都是正常.