Why is the engine noise loud after just changing the oil?
2 Answers
The reasons for loud engine noise after an oil change are: 1. The oil viscosity does not match the vehicle; 2. Use of inferior quality oil; 3. Overfilling of oil; 4. Mixing different types of oil. The functions of engine oil include: lubrication and anti-wear, auxiliary cooling, cleaning, sealing and leak prevention, rust and corrosion prevention, and shock absorption. Types of engine oil: 1. Conventional mineral oil; 2. Semi-synthetic oil; 3. Fully synthetic oil. The method for changing engine oil is: 1. Lift the vehicle, remove the undercover, and place a container of about 10 liters under the drain plug; 2. Unscrew the drain plug, use an air gun to blow into the oil filler port for two minutes, tighten the drain plug after draining, and wipe and check for leaks with a paper towel; 3. Reinstall the undercover, lower the vehicle, and use a funnel to add oil into the filler port.
I just experienced this issue - the engine noise getting louder after an oil change is really annoying. There could be several reasons: the viscosity of the new oil might be inappropriate, like switching from 5W-30 to 5W-40 - higher viscosity increases engine operating resistance; overfilling the oil also raises rotational resistance, never exceed the upper mark on the dipstick; incomplete drainage of old oil mixing with new oil affects lubrication; counterfeit or low-quality oil is even worse, accelerating part wear. I remember last time the noise persisted for three days after an oil change, and it turned out the oil filter wasn't properly installed causing air leakage - tightening it fixed the problem. I suggest monitoring it for a few days - if the noise doesn't decrease or metallic friction sounds appear, go back to the repair shop immediately for inspection.
