Skip the auto shop - Our mechanics make house calls

Q: Engine has sludge.

asked by on

My engine has sludge in it. The dealer says the engine needs to be replaced. Can sludge be removed? If so, what is the cost? If not, what is the cost of replacing an engine?

Replacing an engine is a very costly repair. Oil sludge often results from contaminated or neglected oil. Not having oil changed at regular specified maintenance intervals will cause sludge to build up inside the engine. Sludge if not excessive can be removed via an oil system flush. A flush consists of a detergent additive that is run through the engine oiling system and these detergents break down the sludge and then the oil system is drained. Unfortunately, though once excessive oil sludge develops in the engine lubricated engine parts become starved of oil and premature wear of components and failure often occurs. Before replacing an engine though I would recommend a second opinion by a mechanic, such as one from YourMechanic, who can determine if a flush can save the engine or if an engine replacement is going to be the only option.

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. Engine has sludge.

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: Do I have to break in my new vehicle?

If you’ve recently purchased a vehicle, you’re in luck. This vehicle doesn’t require any elaborate or tedious “breaking in” activities. However, your new vehicle will last longer and run more efficiently if you follow these guidelines when you first begin...

Q: Raw fuel smell and jerks at 19 mph after acceleration

Hello, It sounds like you may have a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital...

Q: Repeated Fuel Injector Seal Failure

O-rings on fuel injectors have to be liberally lubricated with engine oil prior to installation. Installation is typically made with a twisting motion as you push the injector into the bore on the fuel rail. Be sure the aluminum surface...

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...
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...
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.