Does the Engine Oil Passage Need Cleaning?

[PeterMarie]

Engine oil passages do require cleaning. If you haven't completed high-speed running-in yet, you can wait until after the first maintenance to perform high-speed running, then clean the engine oil circuit during the next maintenance. Additionally, engine cleaning should be performed during every maintenance service. The reasons why engine cleaning is necessary are as follows: 1. If the engine isn't cleaned, once clogged, it will affect engine performance. Dirt remaining on internal engine components will accelerate wear, causing insufficient oil pressure that leads to valve noise and engine knocking, ultimately shortening the engine's lifespan. 2. Due to the characteristics of electronic engine control, wax and gum deposits from gasoline remain after each combustion cycle. Repeated heating hardens these deposits, forming carbon buildup. When carbon accumulates on valves, part of the injected fuel gets absorbed, diluting the actual air-fuel mixture entering the cylinders. This causes poor engine performance and various abnormalities. In severe cases, it may result in incomplete valve sealing, causing complete cylinder failure due to lack of compression, or even valve sticking. This creates interference between valves and pistons, eventually damaging the engine.