How many kilometers should a car's piston rings be replaced?

1 Answers
OBennett
07/30/25 8:01am
It is best to replace them every 500-1000 kilometers. Below is relevant information about piston rings: Definition: A piston ring (Piston-Ring) is a metal ring fitted into the grooves of a piston. Piston rings are divided into two types: compression rings and oil rings. Compression rings are used to seal the combustible gas mixture in the combustion chamber, while oil rings are used to scrape off excess oil from the cylinder walls. Functions: Piston rings serve four main purposes: sealing, oil control (regulating oil), heat conduction (heat transfer), and guidance (support). Sealing: This refers to sealing the combustion gases, preventing them from leaking into the crankcase, minimizing gas leakage to improve thermal efficiency. Gas leakage not only reduces engine power but also degrades the oil, which is the primary task of the compression ring. Oil control (regulating oil): This involves scraping off excess oil from the cylinder walls while maintaining a thin oil film to ensure proper lubrication of the cylinder, piston, and rings. This is the main function of the oil ring.
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