After changing the oil, the engine becomes black
One
The engine oil has good cleaning power, and can effectively clean the oil sludge, gum and other impurities in the engine.
It is normal to use 4000 kilometers of black oil, the black is not normal, it is proved that it does not play a role in removing impurities, so black oil is more clean.
More importantly, the oil will soon become black, and may not affect the quality of the oil and normal use.
Engine noise, weak power, what's the relationship with the oil?
Two
The power goes down, the noise gets bigger, and it doesn't have much to do with the oil. At most the most is the use of oil viscosity is too high, leading to a small problem in the operation of the engine, then the noise is relatively higher than usual.
And the emergence of these problems, most likely due to the engine carbon deposition. People choose to change the engine oil time is usually the engine most need to clean, so the oil engine after the occurrence of such a coincidence probability is very big.
After engine oil change, engine abnormal sound, camshaft timing failure and other problems, but also the reason for oil?
Three
In fact, oil doesn't have any effect on them at all, let alone these problems, and it's more likely that the car itself is a problem.
Most of the above problems are not related to the oil, and can be changed regularly according to the maintenance manual.
