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Why Does the Engine Noise Increase After Car Maintenance?

2 Answers

McElena

08/30/25 6:24am

Here are the reasons why the engine noise increases after car maintenance: 1. Different engine oil was used during maintenance. 2. Too much engine oil was added. 3. The old engine oil was not completely drained. Here is some extended information about car maintenance methods: 1. Turn on the ignition before starting the vehicle. 2. Regularly check the brake pads. 3. Let the car idle for a minute when starting cold. 4. Refuel in time before the oil light comes on. 5. Do not drag the gear while driving. 6. Do not accelerate sharply when starting; shift gears when reaching a certain RPM. Here is some extended information about the maintenance items to be done at 30,000 kilometers: 1. Replace the engine oil, oil filter, and air filter. 2. Replace the fuel filter, clean the throttle body, and replace the spark plugs. 3. Some 4S shops may require other maintenance items; car owners should consider and perform maintenance based on actual conditions.

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Barbosa

09/12/25 3:28am

Just after maintenance and the engine sounds louder - I've encountered this several times. As an experienced driver, let me share some insights. A common cause is using the wrong oil viscosity. For example, if your car requires 5W-30 low-viscosity oil but the shop used 10W-40 high-viscosity oil, poor lubrication makes the engine work harder, causing knocking sounds. Another possibility is loose installation of air filters or oil filters, leaving gaps that allow air leaks or oil seepage, creating extra noise. Once after maintenance, I found the belt tension was improperly adjusted, increasing vibration and producing a humming sound while driving. Also, mismatched spark plug models can cause ignition timing issues and uneven combustion, resulting in ticking sounds. I recommend checking your maintenance records to confirm what parts were replaced, then listen for noise sources near the engine during cold starts. If the problem persists for 2-3 weeks without improvement, immediately return to the service center for rechecking. Don't cut corners - small issues left unattended could lead to major engine overhauls, costing both money and peace of mind.

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