Before this，We must understand the function of engine oil。Motor oil is equivalent to the "blood" in a car engine，The main purpose is to flow between various parts of the engine，Produces lubrication，Prevent severe wear between components。

In addition to this most important function，It also has some "extras"。For example, cooling down、Cleaning、Sealed and leak-proof、Anti-rust and anti-corrosion、Shock absorbing and buffering purposes，The effect is evident。Changing engine oil is one of the most routine maintenance items in car maintenance，High-quality engine oil can not only protect the engine、In addition to reducing the number of oil changes，Can also save gas expenses。But，Many people know very little about the use of engine oil，There are even certain misunderstandings，If you are not careful, you may destroy the car in minutes！

Blackened engine oil does not mean it has gone bad，The quality of brand genuine engine oils now on the market is quite high，Can maintain lubrication function under high temperature conditions。

Generally speaking，After adding new engine oil，Sludge, carbon deposits and other deposits on the machine parts are dispersed in the oil，After a certain period of time, the color of the engine oil will turn black。Experienced technicians will use the viscosity of the engine oil to determine whether it needs to be replaced，Instead of observing the oil becoming black，Just concluded that it needs to be replaced。

During daily maintenance，General vehicle maintenance intervals are 3 months or 5,000 Seabetkilometers，For some German cars, it is 6 months or 10,000 kilometers。Many car owners will implement whichever standard comes first，In fact it’s not the case。

When changing the engine oil, you can follow the manufacturer's maintenance policy and it is best to change it every 5 months，Even if you only drive one or two thousand kilometers in half a year，Also need to be replaced，Because the engine oil will deteriorate if left for too long，Cannot provide lubrication，It will only cause increased wear。If you drive every day，Replacement every 5000 kilometers is better for engine maintenance。Also，It’s worth noting，It is not possible to add as much engine oil as possible，The oil level should be controlled seabet loginabove the oil dipstick、Between the lower tick marks is better，Not too much，Not too much。

Pay attention to checking when using engine oil，Generally for 3 months，Check the oil color after 3 months and 5000 kilometers.、Viscosity, etc.，Check whether it has gone bad。Also，Driving in the city，There are traffic lights wherever you go，Traffic jams at every turn，And most of the distances for each trip are no more than ten kilometers，This kind of driving method belongs to "wasting driving"。In the case of "impairing driving"，It is recommended to shorten the interval between oil changes，In order to effectively protect the engine。

Currently，Various engine oil additives are popular on the market，All claim to be able to effectively reduce wear of machine parts，Reduce fuel consumption，Many car owners are already eager to try it。

You cannot add oil additives indiscriminately，There may be incompatibility or chemical reaction between engine oil and additives。 If the car owner adds unsuitable additives to the engine oil，Will cause changes in the lubricating properties of the engine oil，Not only will it not reduce the wear of machine parts，On the contrary, it will cause more serious damage to the vehicle。

The amount of engine oil should be controlled seabet loginabove the oil dipstick、Between the lower tick marks。Because too much engine oil will escape from the gap between the cylinder and the piston into the combustion chamber and form carbon deposits。These carbon deposits will increase the engine compression ratio，Increase the chance of detonation。

Secondly，Excessive engine oil increases the stirring resistance of the crankshaft connecting rod，Increase fuel consumption。

Again，Adding too much oil will increase the internal pressure of the engine，Easy to cause oil leakage from engine seals。

Some car owners think that adding high viscosity lubricating oil can protect the engine，Some car owners think that using low viscosity engine oil can save fuel，There are certain misunderstandings in these ideas。To prevent friction of internal engine parts，The engine oil must have sufficient viscosity，Otherwise, sufficient oil film protection cannot be formed at operating temperature。However, using engine oil with too high viscosity，Will cause the internal flow of engine oil to slow down、Increased resistance，Increased fuel consumption，Also reduces the power output of the engine。

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Use engine oil with too low viscosity，Although liquidity is guaranteed，But it is difficult to form a good oil film protection at operating temperature，Will cause damage to the engine，It will also cause a loss of power。So only use the correct oil viscosity，Only to make your car reach its best condition。What is the best oil for your car’s engine，The vehicle manual is the clearest。

Not changing the engine oil for a long time，The engine oil’s ability to protect the engine will be reduced，Unable to form a lubricating protective film on the outer wall of the part，Once the lubricity of engine oil is reduced，It will directly lead to increased wear of parts。

Only replenishing the engine oil without changing it can only make up for the lack of engine oil quantity，Cannot fully compensate for the loss seabet loginof lubricant performance。