What Causes Slight Engine Oil Leakage?

[DeMorgan]

Engine slight oil leakage can be attributed to the following reasons: Aging and hardening of sealing rings: Over 90% of oil leakage issues are caused by rubber sealing rings losing a significant amount of plasticizers and softeners due to prolonged exposure to alternating cold and hot temperatures, leading to corrosion, aging, and hardening. Incomplete combustion: Small fuel injection advance angle, incomplete combustion, slight water leakage in cylinder liners, presence of water in fuel, white smoke emission during cold starts which disappears as the engine temperature rises. Failure of the smoke limiter: Air-fuel ratio imbalance, decreased cylinder pressure, premature fuel injection timing, failure of the smoke limiter on the fuel injection pump, malfunction of the exhaust brake system, engine cylinder liner wear, piston ring sticking, misalignment, aging and deformation of valve sealing rings, excessive valve guide clearance.