Skip the auto shop - Our mechanics make house calls

Q: Mixing engine oil causes light knocking in the engine. Should the oil be changed immediately?

asked by on

mixing engine oil accidentally(10w-30 and 10w-40) causes light engine knocking. It started about 3 weeks ago, should I change oil immediately ?

My car has 66000 miles.
My car has an automatic transmission.

If you are using too thick of an oil, the engine may not be properly lubricated. The oil should be changed as soon as possible. If the engine was previously low on oil, topped off with additional oil, and noise persists, the engine’s internal bearings may have been damaged. Have the oil and filter changed, put in the correct oil, and see if noise continues. If it does, a YourMechanic professional can help you check the engine for bearing damage.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Mixing engine oil causes light knocking in the engine. Should the oil be changed immediately?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Bad gas mileage and always runs in 4WD - 1979 Chevrolet K20 350 V8

Hi there, thanks for your question. Yes, these older Chevys do have full time four-wheel drive. There are kits available that will disengage the differential from the transfer case, but I've heard mixed reviews on how well they work. You...

Q: Loud knocking while driving straight and while turning left and right

Hello. If the knocking only occurs when the vehicle is moving then you either have an engine mount issue or a suspension problem. A knocking is usually the result of bad starts, a loose ball joint, or a bad bushing....

Q: Trouble code P0607 Engine Control Module & P0138 Oxygen Sensor Circuit

Replacing an engine control module should never be a first step. There are a number of other problems that can give a PO607 trouble code. First the battery voltage should be checked, and if the engine is running, the charging...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...