What are the reasons for a car engine being louder after maintenance?

[VonKyle]

Reasons for a car engine being louder after maintenance include not using the same type of engine oil, excessive carbon buildup in the car, or overfilling with oil. Not using the same type of engine oil: In China, automotive oils are classified into two types: 5w30 and 5w40, each suitable for different environments. Changing to a different type of engine oil during maintenance can lead to issues like increased engine noise. It is advisable to choose the same type of engine oil when replacing. Excessive carbon buildup in the car: Thinned engine oil can easily lead to oil burning, resulting in increasing carbon deposits that significantly reduce engine power. When new oil is added, the engine may not adapt to the oil's viscosity, causing higher RPMs and consequently louder engine noise. It is essential to clean the carbon deposits promptly. Overfilling with oil: When there is too much oil in the engine, it creates unnecessary resistance to the crankshaft's rotation, affecting power output, increasing fuel consumption, and making the engine louder. To reduce pressure inside the engine, a small amount of oil should be drained.

[LaAdrian]

I've driven quite a few cars, and it's quite common for the engine noise to increase after maintenance. First, it could be related to the engine oil. The viscosity of the newly replaced oil might be different, or the technician might not have added the right amount—too little or too much can make the engine run less smoothly. Second, check the air filter. If it's not installed tightly, the airflow is restricted, and the engine has to work harder. Are the spark plugs new? If they weren't tightened properly or aligned correctly during installation, they can cause unusual noises. A loose belt is another factor; improper adjustment after maintenance can lead to slippage and friction. Also, don't overlook the psychological effect—your ears might be more sensitive right after maintenance. I recommend doing a simple self-check first. If the noise persists, take it to a professional shop for a recheck immediately—don't compromise safety. After all, unusual engine noise could be a minor issue, and addressing it promptly saves hassle.

[McAshlyn]

I love tinkering with cars, and it's really annoying when the engine gets louder after maintenance. The prime suspect is the newly replaced engine oil – either the viscosity is wrong, or the amount is off. Too much oil increases the load, while too little leads to insufficient lubrication. If the air filter isn’t installed properly, more dust gets in, and the engine will roar dryly. Improper spark plug installation is another pitfall—incorrect gap adjustment or loose tightening can easily cause noise. The belt system should also be checked; it might have been forgotten during maintenance, and if it’s loose, it’ll squeak. Additionally, an improperly adjusted fuel system, like clogged fuel injectors, can also create noise. Personally, I prefer using a diagnostic tool first. If the noise is excessive, I’ll go back for repairs. Small mistakes during maintenance are common, so just stay vigilant. Regular checks can prevent these issues, saving you from constant repairs.

[JuliannaFitz]

As a mom who frequently drives my kids to school, I recently noticed the car is making loud noises after maintenance, which is quite unsettling. There could be several reasons for this, such as switching to a different brand of engine oil—if the viscosity is too high or too low, it can cause increased noise. If the air filter isn't installed properly, restricted airflow can make the engine work harder and noisier. Spark plugs that are misaligned or loose can lead to unstable ignition and additional noise. Cooling system issues, like insufficient coolant after maintenance, can also cause poor heat dissipation and noise. Psychological factors play a role too; after maintenance, we tend to pay more attention to every little detail of the car. I strongly believe in safety first—don’t ignore unusual noises. Take the car back to the shop for a check-up to ensure smooth driving. Start with simple checks like oil levels and the air filter, and seek professional help if needed.