What is the carbon deposit in the automobile oil circuit? What is the difference between it and throttle carbon deposit, nozzle carbon deposit, intake branch carbon deposit and engine internal carbon

What is the carbon deposit in the automobile oil circuit? What is the difference between it and throttle carbon deposit, nozzle carbon deposit, intake branch carbon deposit and engine internal carbon deposit? The so-called carbon deposition refers to the colloid produced by incomplete combustion and high temperature oxidation. Strictly speaking, the residue on the intake manifold and throttle cannot be called carbon deposit. Carbon deposition is mainly concentrated in valves, direct injection nozzles, spark plugs and keyboards on pistons. As long as the residue related to machinery is called carbon deposit, it is difficult to clean up the carbon deposit once it swims, and it can't be solved by making a bottle or spraying something casually. This has become a habit.