If you're changing the engine oil by yourself or if you're planning to send it to a workshop, make sure after draining the engine oil you open this bleed bolt and start the engine until a little oil flows out. This is to remove trapped air pockets from the engine oil circulation system. Many people overlook this. Workshops usually don’t do this step. If you start the engine, you will hear the sound of air bubbles coming out from this hole. You can refer to the manual where it is actually written there.
