Why Does Engine Oil Smell Like Gasoline?

[LeKayden]

Reasons for gasoline smell in engine oil: 1. Long-term failure to change the lubricating oil leads to reduced oil film thickness and inadequate piston lubrication; 2. Scratches on the cylinder wall cause blow-by gases; 3. Prolonged continuous use of the engine increases the clearance between the piston and cylinder wall; 4. Frequent short-distance driving and cold starts without warming up the engine prevent gasoline from being adequately vaporized and escaping. Consequences of blow-by gases: 1. Gasoline vapor condensing in the crankcase dilutes the engine oil and degrades its performance; 2. Water vapor in the exhaust gases condenses in the oil, forming foam and disrupting oil supply; 3. Sulfur dioxide in the exhaust reacts with water to form sulfurous acid, which further oxidizes to sulfuric acid, corroding and damaging engine components; 4. Increased pressure in the crankcase compromises engine seals, leading to oil leaks.