Tire Rotation:
Tires should be rotated every six months or 6,000 to 8,000 miles. (2300 英里太勤了，没必要)
4-wheel alignment:
For most cars, there are no specific requirements. Your mechanic would typically recommend doing the wheel alignment every two-three years or if there are signs that the alignment is off. Often, the wheel alignment is recommended when new tires are installed.
四轮定位 (4-wheel alignment) 不当的症状是什么？
– 直行时方向盘偏离中心
– 在平直的道路上行驶时，车辆向一侧拉
– 车辆的行驶状况不佳，感觉不稳定，左右摇摆
– 转向时轮胎在尖叫
– 轮胎磨损不均匀
