Q9: When the second “BT-X Fuel Saver” is installed after 5 years, should the first one be taken out ? 问9：5年后第二次要置入【BT-X环保节油器】第一次置入的须取出吗？

Answer 9: Not necessary. Because the “BT-X Fuel Saver” is small and it will not take much space.

答9：不用取出。因为BT-X环保节油器体积很小不会占太大空间。