1. The simplest method is to add a commercial engine cleaner to the oil and then run the engine for a few minutes. The cleaner will dissolve the sludge and it can then be drained out along with the old oil.
2. If the sludge is particularly heavy, you may need to remove the oil pan and clean it out manually. To do this, you will need to:
* Drain the oil.
* Remove the oil pan.
* Scrape off the sludge with a putty knife or similar tool.
* Wash the oil pan with soap and water.
* Dry the oil pan thoroughly.
* Reinstall the oil pan and add new oil.
3. You can also use a solvent, such as kerosene or diesel fuel, to clean the sludge from the engine. To do this, you will need to:
* Remove the spark plugs.
* Pour the solvent into the cylinders.
* Let the solvent sit for several hours or overnight.
* Crank the engine over a few times to loosen the sludge.
* Drain the solvent.
* Replace the spark plugs.
* Add new oil to the engine.
Whichever method you choose, it is important to remove the sludge from the engine as soon as possible. Sludge can cause a number of problems, including:
* Reduced oil flow
* Clogged oil passages
* Engine overheating
* Engine failure
