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?
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: Using oil blend on a car that requires synthetic oil

Looking at the information for your vehicle, it does not say that synthetic oil is required. Using a synthetic blend will be just fine. You can also switch back and forth between synthetic and non-synthetic without doing any damage. If...

Q: Making a ticking noise as I drive and in park at idle

Without hearing the noise, it's impossible to say what it is, But I'm going to suggest that you may have a valve noise because that is a sound that most people describe as "ticking" It's is a regular sound that...

Q: Q: How do I adjust the cruise control speed?

Once the cruise control is set, you can adjust the speed very easily. To increase the cruise control speed, pull up on the cruise control lever. To decrease the speed, pull down on the cruise control lever. If you briefly...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.