What is the black oil under the car door?

1 Answers
Peeta
07/30/25 12:37am
Black oil under the car door may be caused by internal engine oil leakage, and it is recommended to have it inspected at a 4S shop. Here is some relevant information about engine oil: 1. The role of engine oil: Engine oil lubricates, cleans, cools, seals, reduces friction, prevents rust, and protects against corrosion in the engine. 2. Engine oil determines the lifespan of the engine: The engine is the heart of a car, containing many metal surfaces that rub against each other during high-speed movement in harsh conditions, with operating temperatures reaching 400°C to 600°C. Under such extreme conditions, only qualified lubricating oil can reduce wear on engine components and extend their service life.
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