Why does the Magotan make abnormal noise for a few seconds during cold start and then disappear?

[ArcherRose]

The reasons for the Magotan making abnormal noise for a few seconds during cold start and then disappearing are as follows: Incomplete lubrication of the car: When the car is cold, due to gravity, all the engine oil is in the oil pan and has not yet fully lubricated all parts of the engine. At this time, when starting the engine, there is no oil film between the components, especially in areas such as the cylinder head and valves. Without lubrication, abnormal noise will occur. Generally, after the car warms up, the components get lubricated, and the noise will disappear. Other reasons: Abnormal noise caused by valve tapping; abnormal noise caused by the generator belt being too tight; abnormal noise caused by the generator belt slipping; abnormal noise caused by the timing chain loosening, etc. It could also be that the belt hardens when the car is cold. You can try pouring some water on the belt to see if the noise disappears. If it does, it is because of the belt.

[EllieAnn]

A squealing noise during cold start that disappears after a few seconds is mostly caused by engine components, such as a loose or aged belt creating friction when cold, which quiets down once the oil warms up and lubricates. It could also be due to insufficient oil pressure in the valve lifters—when the engine is cold, oil hasn't circulated yet, but it normalizes after a few seconds. If the noise is brief and doesn't affect driving, you can first check if the belt is cracked yourself. However, it's best to visit a 4S shop to have a mechanic inspect the timing chain or tensioner to prevent minor issues from worsening. I've driven a similar car before, and replacing the belt or changing the oil improved the situation significantly. Regular maintenance can prevent such problems proactively.

[DaniellaAnn]

My old Passat also experienced cold-start noises that sounded like friction, which disappeared immediately after the engine warmed up. It was probably related to the belts—maybe the alternator or AC belt was loose or aged, becoming stiff when cold and squeaking upon startup, then quieting down as elasticity returned with temperature. I check belt tension and use the right viscosity oil at every service, which has significantly reduced such noises. Pay attention when you drive; if the noise keeps getting louder, get it fixed promptly to avoid chain wear affecting engine lifespan. Don’t underestimate it—spending a little on prevention is wiser than costly major repairs.

[McJosiah]

The noise stops after a few seconds, which is usually caused by insufficient oil pressure during cold starts and component friction. For example, a loose belt or a timing chain that doesn't move smoothly at low temperatures will stop making noise once the oil reaches it. I recommend first checking if the engine oil is suitable—if it's too thick or too thin, it can cause this issue. Then, take it to a repair shop for a system check to avoid minor faults leading to more serious problems. Proper maintenance makes your car more durable.

[Wilson]

Cold start noise may be caused by belt or oil circuit issues, but if it disappears after a few seconds, it indicates a temporary problem. Possible reasons include belt aging, cold contraction friction, or insufficient lubrication causing noise. I often see car owners ignore this, but prolonged neglect can damage internal engine components, such as chain elongation. Promptly check the generator and oil pressure system, and replace parts if necessary. Maintaining proper tire pressure and regular oil changes can reduce the risk of noise and ensure driving safety.

[VanEverly]

The abnormal noise disappears in a short time, mainly due to improper operation of components during cold starts. For example, the hydraulic lifters may make a clicking sound when oil hasn't flowed to them at low temperatures, stopping once the oil reaches them, or the belt may stiffen and rub when cold. From my experience, switching to a lower viscosity full synthetic oil can improve this because it lubricates faster during cold starts. Additionally, letting the car idle for half a minute to warm up before driving and regularly checking the belt for cracks during maintenance can extend the vehicle's lifespan and prevent unexpected failures.