推荐回答（2个）
如果把发动机看成是一个心脏，那么机油就是发动机的"血液"，是发动机保养中至关重要的一环。而如今机油市场种类繁多，品牌众多，车主们在选择机油时一头雾水。在国内知名大最大的无非就是美孚、嘉实多和壳牌，作为市面上主流的三大机油品牌，各自都有特点呢？
美孚
美孚机油主打高品质，走技术流路线，坚持使用合成油技术。美孚独家研制的聚α-烯烃的基础油，分子排列整齐，抗氧化、抗高温性强，正如其广告"成功挑战18000km换油周期"所说，美孚机油最大的特点就是换油周期长，运动性能和抗高温性能表现出色。高品质自然伴随高售价，这也是美孚的"缺点"所在。
嘉实多
嘉实多机油冷启动保护出色，采用独特的配方，能使机油形成油膜，吸附在金属机件表面，保证了低温情况下启动机油也能迅速到达各机件表面，为发动机提供更及时的保护。同时抗磨性能优越，能从容面对各种苛刻的路况。
缺点就是国内的嘉实多品质普遍比国外差，清洁能力稍弱，机油衰减速度较快。
壳牌
壳牌机油清洁能力突出，发动机使用了一定的时间很容易产生油泥、积碳等，而壳牌能够有效清理发动机内的油泥、积碳这些沉积物，保护发动机。同时静音效果也不错。
其缺点就是高性能机油缺乏，换油周期短。
什么时候换机油？
很多车主对于爱车什么时候应该更换机油拿捏不准，在这里给你们普及一下。理论上来讲，一般是5000公里或者半年更换一次，其实现在发动机的工艺和品质已经相当不错了，是可以到8000公里甚至10000公里再进行更换机油的，全合成机油的话则可以更长。
并且还要根据日常行驶路况来决定，如果日常跑高速较多的话，那么我们可以适当的延后一些，因为高速路上路况很好，没有红绿灯，堵车现象也不会这么频繁，发动机输出环境舒畅。而如果日常都是市区道路行驶的话，经常会等红绿灯或堵车，车子虽然没有跑起来，里程不会增加，但发动机仍在正常运转的，那我们就可以提前一些公里数。
这三个品牌都是国内主流品牌，品质、性能好，只是各自的侧重点不同，主打的方向不一致。车主们在选择机油时只需根据自己车辆的实际情况来选择即可，适合自己车子的机油就是好机油。
我现在用的GT魔力红，PAO和酯类基础油的配方，动力挺好，也足够耐用，PAO基础油为主抗衰减性能还行，一万五千公里换一次，非常省心。
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