This should be familiar to everyone, but do you know how to choose the right engine oil? It is generally divided into gasoline engine oil and diesel engine oil. It plays the role of lubrication, cleaning, cooling, sealing and rust prevention in automobiles. Internationally, API grade is generally used to distinguish engine oil. API engines are divided into two types. The beginning of's' represents gasoline engine oil, which can be found on the engine oil barrel (generally from sa-sl)‘ The beginning of C 'represents diesel engine oil. The level of engine oil is s. with each increasing letter after it, the engine oil will be better than the previous one. At present, most of them are SF or above in the world (such as Castrol, shell, Mobil, etc. are Sn or above).

ASE粘度等级，很多车友都问我，4s店的10w-40和0w-40这两种那种好。不懂得朋友可以淘宝一下机油，一般机油桶上面都会标注。‘W’表示winter（冬季），前面的数字越低说明在低温的流动性越好，车子在冷启动时对发动机保护越好(一般在南方比较多的选择10W或者5w就可以，在北方多的选择可以选择好一点的机油)。

Many riders asked me about the ASE viscosity grade. The 10w-40 and 0w-40 recommended by the 4S store are good. If you don't know, you can clean out the oil on Taobao. Generally, the oil bucket will be marked on it‘ W 'means winter. The lower the number above, the better the fluidity at low temperature and the better the engine protection during cold start (generally, 10W or 5W can be selected for more choices in the south, and better engine oil can be selected for more choices in the North).

‘W’后面代表的是机油耐高温的指数，数值越大说明机油在高温保护性能更好，反之数值越低高温发动机保护性能越差。不是机油越贵就越好，一般跑车发动机使用的都是机油10W-60甚更好的，这种超跑机油特别稀，流动性，保护性方面肯定是特别好的，但是这种机油是不建议加到家用车里面的。（粘稠度太低容易会引起烧机油，机油会从活塞环，气门等间隙流畅进去，当然所有的燃油车都是有正常机油损耗的）。就像是你月入3000去租超跑相亲一样，华尔不实。

The following 'W' represents the high temperature resistance index of engine oil. The greater the value, the better the protection performance of engine oil at high temperature. On the contrary, the lower the value, the worse the protection performance of engine at high temperature. It's not that the more expensive the engine oil, the better. Generally, sports car engines use top-grade engine oil 10w-60 or even better. This super running engine oil is particularly thin, and its fluidity and protection must be particularly good. However, this kind of engine oil is not recommended to be added to household vehicles. (if the viscosity is too low, it will easily cause oil burning, and the oil will flow in through the gaps of piston rings and valves. Of course, all fuel vehicles have normal oil loss). It's like you rent a super run blind date with a monthly income of 3000. Wall Street is untrue.

机油的更换周期，新车一般是5000保养一次（期间是建议多跑跑高速，让发动机磨合更好），具体的保养周期要询问4s店，因为像有些车，新车发动机里面自带全合成油，10000保养一次，还有就是半合成机油7500每半年以先到为准保养一次。和机油一起换的还有机滤，放油螺丝和放油螺丝垫片（一般是4s店会更换，原厂放油螺丝是带磁性的，会吸附机油里面的铁屑，这个也就十几块，是建议一起更换的），机滤的作用顾名思义，说白了就是过滤机油里面杂质的，因为发动机运转，里面铁跟铁摩擦是会产生铁屑的。

The oil replacement cycle for new cars is usually 5000 km (during this period, it is recommended to run more high-speed to make the engine run in better). The specific maintenance cycle should be asked from the 4S store, because like some high-end cars, the new engine comes with full synthetic oil, which is maintained once every 10000 km, and the semi synthetic oil is 7500km, which is maintained once every six months, whichever comes first. The machine filter, oil drain screw and oil drain screw gasket are also replaced with the engine oil (generally, the 4S store will replace them. The original oil drain screw is magnetic and will absorb the iron filings in the engine oil. This is only a dozen pieces. It is recommended to replace them together). The function of the machine filter is as the name suggests. In short, it is to filter the impurities in the engine oil because the engine is running, The friction between iron and iron will produce iron filings.

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