It's not that if a car breaks down, it has to go to a repair shop to repair and maintain it. Some drivers can handle it by themselves, so they don't have to spend the wrong money. Sometimes, for example, the owner will find it difficult to start the car again after a long parking time. In fact, it's quite common, especially when the car is parked for a long time. In winter, because the gasification rate of fuel decreases, the engine is not easy to burn, and the owners can pour hot water or steam into the radiator to help gasify.
Some new cars will feel serious jitter when they start driving. In fact, it's normal. It's not the quality problem of the car. It may be that the impurities or blockages in the fuel supply system are caused by a long period of time without cleaning up. It's good to clean it up at this time.
The same is true of engine blackening, first of all due to the role of detergents and dispersants, and secondly due to the oxidation of oil in use. If a kind of oil does not turn black in use, it means that the oil has not played its normal cleaning role at all. At present, engine oil generally contains detergent dispersant, which absorbs the carbon deposit and the oxide of engine oil produced by combustion, so that it can be replaced when changing oil, so as to ensure the internal cleanliness of engine. Therefore, the newly replaced oil blackening is not necessarily caused by the internal dirty engine, as long as the oil can be changed according to the specified time.