What Causes Increased Engine Noise After Maintenance?
3 Answers
Possible reasons for increased engine noise after maintenance include: differences in quality between the new oil and the previous oil; insufficient viscosity or lubrication film thickness of the new oil; improper maintenance procedures or oil type mismatch with the vehicle model. Details about car maintenance are as follows: 1. Antifreeze usage tips: It's best to use antifreeze year-round. Besides its cooling and anti-freezing functions, antifreeze also cleans, prevents rust and corrosion, reducing radiator corrosion and protecting the engine. Pay attention to choosing the correct antifreeze color and avoid mixing different types. 2. Brake fluid usage tips: The performance of the braking system is closely related to brake fluid. When inspecting or replacing brake pads, discs and other hardware, don't forget to check if the brake fluid needs topping up or replacing.
After running this auto repair shop for years, I've seen countless cases where engine noise increases after maintenance. There are multiple causes: possibly using incorrect oil viscosity (too thin oil reduces internal lubrication), improperly installed oil filters introducing air into the system, or newly exposed sounds after carbon deposit removal. Loose belts/brackets during service can also cause abnormal noises. Sometimes it's psychological - perceived louder sound without actual change. First steps: check oil level/color, identify noise frequency (high-pitched or rumbling). If persistent, avoid long drives and return immediately for inspection. Never compromise safety - minor issues left unchecked may lead to engine overhaul. Always use OEM-approved oils and parts for maintenance.
Ever since my car maintenance last year, I've noticed the engine sound has become alarmingly loud, which is really worrying! The possible reasons could be the wrong type of engine oil used—maybe it's too thin or has too many impurities; or the filter wasn't installed tightly, causing air leaks; it could also be that a screw was loosened during the operation, like a poorly sealed oil pan. This change makes driving particularly uneasy, with constant fear of engine damage. A friend of mine had a similar issue—the noise got significantly worse over time, and only then did he rush to a professional repair shop, where they found it was an engine oil problem. My advice is not to delay: first, check if the noise during cold starts is normal; if you hear any metal grinding sounds, seek expert help immediately to avoid costly repairs. Choosing a reliable place for maintenance is crucial—prevention is always better than cure.
