Usually when we go for maintenance and oil change, the auto repair shopGeneralWill lift the car with a lift，So that the old engine oil can be drained，Change new oil。

However，Many car owners discovered，There will still be some engine oil left after each maintenance，What is going on？It was the auto repair shop that did not drain out the engine oil？What to do with the remaining new engine oil？How can we make this excess engine oil valuable？

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If the car is lifted by a lift，Old engine oil flows out naturally by gravity，Due to the angle of the oil outlet and the irregular structure of the oil pan，There is always a part of engine oil that cannot flow out naturally。Because the engine oil is used for a long time，There are many impurities，Cannot clean it completely。You can see it if you open the oil pan，Example crankshaft、There is still some oil on the connecting rod，TheseEngine oil cannot be drained out by gravity。Of course，Many auto repair shops now also use oil pumps to extract old engine oil，Maybe it will draw cleaner。In short, it is normal to have a little engine oil left.

Also，There are many ways to lubricate the engine，Some parts cannot rely on oil passage lubrication due to mechanical structure reasons，You can only rely on the constant circular motion of the crankshaft counterweight and the bottom of the connecting rod to splash the oil into the lubrication area，For example, valve、seabet loginDingzhu、Cylinder wall, etc.，If everything is cleared，On the contrary, it will damage the engine when starting。

Of course, there are also some black-hearted roadside shops,Do not drain the engine oil completely，Resell the remaining oil，But these are the minority after all。General auto repair shops are helping car owners change the engine oil，Even if the new oil has not been added，It will also be brought back to the car owner himself。

Although it is normal to have a little engine oil left，But car owners will inevitably have doubts，ThatWill the remaining old oil damage the engine?

Actually,Everyone is simply too worried，The engine oil is clean、Lubrication、Cooling、Anti-corrosion、Sealing and other functions，Metal debris produced by engine internal wear，Can be retained in the oil pan as the oil circulates，BecauseThe oil pan oil pump filters the oil while delivering it to the upper part of the engine，Then the oil will enter the lubricating oil passage，So there will be no damage to the inside of the engine。

Also，Oil in engine operation，Affected by fuel combustion temperature and various media、Catalysis of metals，Gradually deteriorating and aging，Generating carbon deposits、Various substances that are harmful to the engine such as paint film and sludge，So，ToRegularly clean the lubrication system and remove residual oil, to ensure the "health" of the engine!

First, let’s take a brief look,Why does engine oil deteriorate：

Ps: If the owner fills deteriorated engine oil into the vehicle，Then the parts in the engine that need lubrication and cooling will not be adequately protected，The load and wear of the engine will increase，Ultimately causing increased engine wear，Overhaul is not impossible。

Actually,Ordinary engine oil generally has a shelf life of 4 to 5 years in an unopened state，So，Tighten the cap of the opened engine oil，Can also be saved for a longer time, can still be used.

Although the method is proper, engine oil can be stored for a long time, it is recommendedIt is best to use it as soon as possible within half a year。

For example，I found that the engine oil was missing when I checked the oil dipstick，Just in handy。Also，Every time seabet ioyou do maintenance，Let the master use the leftover engine oil first，Use new engine oil，This way the remaining engine oil will be the latest，You don’t have to worry about spoilage。(The content of the article comes from the Internet，If copyright is involved, please contact us to delete)