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 1,000 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  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: Rough slow before 40

Thanks for writing in about your 2000 Mercedes Benz ML430. The fault codes need to be read out of the engine computer. It sounds like there could be a mixture issue causing the rough running and power loss. The MAF...

Q: EPC Check Light is on followed by an engine fault

The EPC light refers to the Engine Power Control indicating a potential engine malfunction which is a general warning that could mean many different things such as the engine speed sensor, mass airflow sensor, or other issues related to throttle...

Q: Car overheats only at low speed

Hello. It is possible that the water pump is not pumping properly or that the radiator has a partial clog which is causing the car to overheat at low speeds. Have a certified technician, like one from YourMechanic, complete an...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...