How often should valve stem seals be replaced?

[SanAlan]

Valve stem seals should be replaced every 20,000 to 30,000 kilometers. As one of the critical components of the engine's valve train, they play a vital role. Valve stem seals prevent engine oil from entering the intake and exhaust pipes, avoid oil loss, and also prevent the leakage of the air-fuel mixture and exhaust gases, thereby preventing the engine from burning oil. The primary material of valve stem seals is fluororubber. Over time, rubber products can age and harden. Therefore, to avoid a series of malfunctions caused by hardened valve stem seals, regular inspection and maintenance of automotive components are necessary. If the valve stem seals are damaged, they should be replaced promptly.