After running 1-2 years (about20000 kilometers), the automobile engine will have performance degradation in different levels:
The reason of above phenomenon might be various, but an important factor which can not be neglected is that the engine has been contaminated. The accumulated carbon make the engine cant's work normally and coordinately, which resulted in a lower overall performance and the car no longer has a good manipulation ability. It also brings hidden danger to the safe driving.
The accumulated carbon inside brings a serious impact to the engine and shorten its service life. As we know, the three killer factors to the engine service life are: corrosion, abrasion and accumulate carbon.