Is Valve Noise Caused by Thin or Thick Engine Oil?

[VonCassidy]

Both excessively thick or thin engine oil viscosity can cause valve noise. If the oil viscosity is too thick, it can affect the normal operation of the hydraulic system, leading to insufficient oil supply and resulting in valve noise. If the viscosity is too thin, it cannot provide adequate lubrication, which over time can cause severe engine wear. Combined with reduced oil pressure, this also leads to valve noise. In terms of engine structure, valves are divided into intake valves and exhaust valves. The intake valve's function is to draw air into the engine to mix with fuel for combustion, while the exhaust valve's role is to expel the burned exhaust gases and dissipate heat.