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The color of the oil depends on the formula of the basic oil and additives，Different basic oils and additive formulas will make the oil show different shades of color。 

The performance of motor oil is evaluated by a series of engine tablet tests and real car road trials，These tests from oxidation、Corrosion、Deposition、Adhesive Ring、Lands、Team、wear and other aspects to test the performance of the oil。

Not necessarily，Some excellent oil contains additives that can dissolve carbon accumulation inside the engine，So it is easy to turn black，But it has no effect on the performance of the oil。

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

① Burn by -product: such as water、acidic substance、Smoke、Carbon accumulation;

② Diluted fuel;

③ High temperature oxidation deterioration of the oil itself;

 Dust and metal particles.

These substances are accommodated in motor oil，At the same time，Additives in the oil will also be consumed with the process of use。Do not change the oil on time，It will significantly reduce the protection of engine oil on engine resistance。

Replacement oil can not only discharge pollutants in the oil，It can also ensure that the ingredients in the engine oil remain at a reasonable level。

When changing the oil, it is usually performed in a hot car，Machine oil viscosity is decreased with the temperature increase，Therefore, replacement of higher temperature motor oil，Its viscosity is thinner than the viscosity at normal temperature，This is a normal phenomenon。

But when the temperature drops to room temperature，Machine oil viscosity is still very low，It is likely to be caused by the dilution of fuel during the use of oil。

① Recommended according to the car factory or service station; 

② According to the car condition ；

③ According to the environmental temperature.

Appearance:

① Oil sample is milky or fog, indicating that the machine oil has entered the water;

② Oil sample becomes gray and may be contaminated by gasoline;

③ Black, the product of incomplete fuel burning.

Smell:

① The irritating odor appears, indicating that the oil is oxidized at high temperature;

② A heavy fuel flavor，It indicates that it is severely diluted by the fuel (a small amount of fuel flavor used by the oil)。

Oil Drops Test:

Take a drop of oil to the filter paper，Observe the change of the spots。

① Machine oil spread rapidly，SeabetThere is no sediment in the middle，It means that the oil is normal;

② Machine oil spreads slowly，Equipment appears in the middle，It means that the oil has become dirty，Should be replaced in time。

Broken Test:

Heat the thin metal piece above 110 ° C，drop of oil，If the oil burst proves that the oil contains water，This method can detect more than 0.2%of the water content。

Machine oil lights are mainly caused by insufficient oil pressure in the lubrication system，Usually there are the following reasons:

① Insufficient oil in the oil bottom shell，Check whether there is a seal and not strictly causing oil to leak。

② Machine oil is diluted by fuel or the engine load is too high to work too high，Leading the viscosity of the oil。

③ Oil channel blockage or the oil is too dirty，As a result, the lubricating system is not smooth。

 Oil pump or oil limit pressure valve or bypass valve card stagnation. 

⑤ The coordination of the lubricating part is too large，Rulikhaft spindle neck and bearing、Lianlian neck and bearing tile severe abrasion，or a shaft tile alloy peel off，Causes too much gap，Increase the amount of oil leakage of motor oil，Reduced the oil pressure of the main fuel duct。 

⑥ Machine oil pressure sensor is poor. 

⑦ There is no correctness to choose the viscosity of the oil according to the working conditions of the climate and engine。

Use low viscosity oil to increase the amount of oil leakage of the lubricating parts，The pressure of the main fuel channel becomes lower。Choose high viscosity oil (especially winter)，Difficulty in oil pump pump oil or oil filter through difficulty，Causes seabet applow pressure of the system oil。