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The color of the engine oil depends on the formula of the base oil and additives，Different base oil and additive formulations will cause the oil to show different shades of color。 

The performance of engine oil is evaluated through a series of engine bench tests and real vehicle road tests，These test from oxidation、Corrosion、Sediment、sticky ring、Oil、Abrasion、Test the performance of engine oil in various aspects such as wear。

Not necessarily，Some high-quality engine oils contain additives that can dissolve carbon deposits inside the engine，So it turns black easily，But it has no effect on the performance of the engine oil。

Oil will gradually deteriorate during operation. The main reasons are:

① Combustion by-products: such as moisture、Acidic substance、Smoke、Carbon deposits, etc.；

② Fuel dilution;

③ High temperature oxidation and deterioration of the engine oil itself;

④ Dust and metal particles.

These substances are contained in engine oil，At the same time，The additives in engine oil will also be consumed during use。Not changing engine oil on schedule，Will significantly reduce the protective effect of engine oil on engine anti-wear。

Changing the engine oil can not only remove the pollutants in the oil，It can also ensure that the ingredients in the engine oil are kept at a reasonable level。

When changing engine oil, it is usually done while the car is hot，The viscosity of engine oil decreases as the temperature increases，So replace the oil with a higher temperature，The viscosity is thinner than that at room temperature，This is normal。

But after the temperature drops to room temperature，Oil viscosity still very low，It is likely that the engine oil is diluted by fuel during use。

① According to the recommendation of the car manufacturer or service station; 

② Based on vehicle condition ；

③ Depending on ambient temperature.

Appearance:

① The oil sample is milky white or misty, indicating that water has entered the oil;

② The oil sample turns gray and may be contaminated by gasoline;

③ Turns black, caused by the products of incomplete combustion of fuel.

Smell:

① The presence of a pungent odor indicates that the engine oil has been oxidized by high temperature;

② Heavy fuel smell，Indicates that it is severely diluted by fuel (a small amount of used engine oil has a normal fuel smell)。

Oil drop spot test:

Take a drop of engine oil and drop it on the filter paper，Observe the changes of spots。

① Motor oil spreads seabet loginrapidly，No sediment in the middle，Indicates that the engine oil is normal；

② Oil diffusion is slow，Sediment appears in the middle，Indicates that the engine oil is dirty，Should be replaced in time。

Burst test:

Heat the thin metal sheet to above 110℃，A drop of engine oil，If the oil bursts, it proves that the oil contains water，This method can detect 0.Moisture content above 2%。

The engine oil light is mainly caused by insufficient oil pressure in the lubrication system，Usually there are the following reasons:

① Insufficient oil in the oil pan，And check whether there is any oil leakage caused by loose sealing。

② The engine oil is diluted by fuel or the engine is overloaded and the operating temperature is too high，Resulting in the thinning of engine oil viscosity。

③ The oil passage is clogged or the oil is too dirty，Resulting in poor oil supply to the lubrication system。

④ The oil pump or oil pressure limiting valve or bypass valve is stuck and working poorly. 

⑤ The fitting clearance of lubricating parts is too large，such as crankshaft main bearing journal and bearing bush、The connecting rod journal and bearing bush are seriously worn，or bearing alloy peeling，Causing excessive gap，Increase oil leakage，Reduced the oil pressure in the main oil gallery。 

⑥ The oil pressure sensor is not working properly. 

⑦ Failure to correctly select the viscosity of the engine oil according to the climate and engine operating conditions。

Selecting engine oil with too low viscosity will increase the amount of oil leakage in lubricated parts，Causing the main oil channel pressure to become low。Choose engine oil with too high viscosity (especially in winter)，Causing difficulty in seabet iopumping oil in the oil pump or difficulty in passing the oil filter，Causing low system oil pressure。