早些年的汽车大修经常会遇到，一般都是二十几万公里就要大修，有的甚至十几万公里就大修。而现在的车发动机质量有了显著提高，如果正常保养、正常用车，很少能遇到大修的车辆。特别是在4S店里，几个月都遇不到一个大修发动机的。不过，虽然整体大修的公里数延长了，不同车辆之间还是会存在很大差别。有的还是二十几万公里大修，而有的可以跑到四五十万公里才大修。那么，发动机的寿命与什么有关呢？有以下3点。

1. Routine maintenance

The focus is on oil replacement, high-speed operation of the engine, and complete oil lubrication to minimize wear. If there is no oil in the engine, a cylinder will burst in a few minutes, and the engine will basically face a major overhaul. Therefore, in order to prolong the life of the engine, it is necessary to have a good lubrication condition at all times. If you want to lubricate well, you must ensure the quality of the oil. That is, the oil must be changed according to the manufacturer's recommended mileage without delay. And the oil to be replaced should meet the use standards of the car, and the quality grade and viscosity grade of the oil cannot be reduced without permission. In addition, it is also necessary to pay attention to the purchase channel, and never use fake engine oil, so that the more you replace it, the more harmful it will be to the engine. How to avoid it? Don't use too much engine oil below the market price, don't be greedy for cheap, go to a 4S store or a regular big store for maintenance.

2. Usage

The worst engine wear is during the cold start phase, where 80% of the wear occurs at this moment. It's okay in the summer, mainly in the winter when the temperature is low, and the wear is the most in the first minute or two of just starting the fire. As a result, the overhaul time for vehicles that are often used for short distances will be significantly shortened. And those who have been using cars for long distances, such as those who are often used for business trips, whose homes are far away from the company, or taxis that are used to operate, have a long overhaul kilometer.

为什么越是开的少反而对车越不好呢？因为相同公里数下，你的处于冷启动阶段的时间越长。比如都是行驶一万公里，拿出租车来举例，打着火就一直跑，只需要两三个月就能达到1万公里，处于冷启动磨损最大的时间总共只有90分钟。而对于短距离行驶的车，行驶这一万公里，处于冷启动磨损最大的时间就要600分钟，远远高于出租车的。

因此，相同公里数下发动机的磨损大大不同，每天行驶距离短的车，经历恶劣工况的时间更长，磨损也更多。这就是在相同保养条件下，有的车20万公里大修，有的车50万公里大修的原因。当然，对于这种情况有人会问怎么改善呢？答案是不需要改善，也不容易改善。因为你每天的用车需求就是那几公里，总不能为此多跑上一段冤枉路吧，这样也会额外损耗燃油。另外，因为行驶里程短，就算一年能达到8000公里，一辆车最多也就能用15-20年。用15年也才12万公里，就算每天磨损多也用不着大修。因此，根据个人的习惯用车就可以了。

3. Car habits

用车习惯不同对发动机的寿命也有影响，比如一个开车很猛的，发动机经常保持在三四千转，起步猛加油，有情况了猛刹车，这样对发动机的磨损当然也就更大。不仅仅是发动机，变速箱以及各种悬挂、球头等寿命都会受到影响，导致最终的车况也不同。别人开五万公里还是与新车差不多，开车猛的开五万公里就显得车比较老了，像是跑了八九万公里的车一样。

Finally, if the vehicle is faulty, it should be repaired in time, and you can't go on the road with illness, because some faults will damage the engine quickly. For example, if the water temperature is high and still driving, the engine will overheat and lock up, burn out the bearings, wear out the cylinder, and lead to overhaul. Similar faults include the oil alarm light on, the engine knocking sound, etc., which can quickly and seriously damage the engine and must be stopped for maintenance.