Why is there a strange smell when the engine gets hot?

1 Answers
VanEvangeline
07/29/25 9:16am
This odor is caused by the evaporation of anti-corrosion coatings and oil stains on the outer surface of the engine when heated. Below are the relevant explanations: 1. Cause: After the engine runs for a period of time, its outer surface becomes very hot, especially components like the exhaust pipe, which have various anti-corrosion treatments, including coatings. Initially, these coatings will partially evaporate when heated, producing a pungent smell. 2. Other causes: (1) Carbon deposits in the combustion chamber cause the piston rings to stick, leading to poor sealing. (2) Sludge forms in the lubrication system, blocking the oil return holes of the oil rings and reducing their oil-scraping performance. (3) Wear occurs between the piston and the cylinder wall.
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