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Flushing the engine with diesel fuel before changing the oil is an old, but reliable and simple way to clean the power unit.

Today, many drivers laugh at the “eccentrics” who use this washing method. Diesel oil makes it possible to remove dirt and carbon deposits without the use of aggressive additives.

You can not worry about the parts of the engine that can be damaged by aggressive influence.

By flushing the engine with diesel fuel, it is possible to simply, inexpensively and safely extend the operating period of the motor.

  • When is flushing necessary?
  • Features of the washing procedure
  • How is flushing performed?
  • Conclusion

  • When is flushing necessary?

    When using a car in the lubrication complex of its internal combustion engine, resin accumulates. Soot appears on the walls of oil channels, which can significantly impair oil circulation and reduce cooling efficiency. The situation is aggravated by the filling of low quality oil fluid.

    All highways may be clogged. Every ten to fifteen thousand kilometers they change the oil. However, if the car was operated in harsh conditions with poor lubrication, then filling in a fresh oil product would be pointless without cleaning the gasoline / diesel internal combustion engine.

    The oil has not been changed for a long time

    It is necessary to flush the engine with diesel fuel before changing the lubricant in such situations:

  • switching to a different type of motor oil;
  • pouring lubricant into a newly purchased car (provided that you do not know the brand of oil that was previously filled in);
  • penetration of coolant or fuel into the oily liquid;
  • completion of a complete overhaul of the power unit.
  • Read also: Application of lubricant Ciatim 201

    Features of the washing procedure

    The main thing for which they wash the engine with diesel fuel is the complete purification of the internal combustion engine from past lubricants and contaminants. Often, cleaning fluids are used that can dissolve solid formations, tar and old oil residues. Usually, special additives are added to the car oil before draining.

    You can also fill in the flushing agent after draining the used consumables. Today's flushes perform their task well, but they are expensive and considered quite aggressive. If they are added to the engine, they can destroy its parts.

    Frequent oil change, better flushing

    Diesel has long been used by those who needed to flush the engine. In the past, it was the most effective flush of all. Diesel oil perfectly dissolves resin and old grease residues. It is fluid, and when passing through the oil channels, it dissolves slag, carbon deposits, and clots of motor oil, and removes them from the power unit.

    Might be interesting: How to add oil to the engine - expert advice

    Diesel, in terms of its own washing characteristics, can adequately compete with special products that wash the engine. At the same time, it does not harm metal elements, linings and seals. The reliability of flushing the internal combustion engine with a diesel engine has been tested for decades in the operation of cars of different models.

    Experienced drivers who clean the engine with diesel fuel are advised to mix it with car oil. A similar mixture is obtained by mixing the same amount of diesel and lubricant.

    How is flushing performed?

    The engine is washed with diesel after draining the old motor oil. Draining is performed as standard, through a hole in the crankcase pan.

  • Put your own car on a viewing ditch or a special overpass.
  • Using a special tool, loosen the drain cap.
  • Place a prepared container under the drain.
  • Remove the cover by pulling it sharply to the side. This is necessary so that the oil jet is directed exactly into the container.
  • Wait until the entire consumable is drained.
  • Remove the car oil filter. This is usually done manually, but if necessary, you can use the key.
  • Install a temporary oil filter. It is necessary only for the engine flushing procedure, therefore it is advisable to purchase the most inexpensive product.
  • Quickly pour diesel into the internal combustion engine (you can mix it with lubricant or use kerosene). Three liters will be enough. The initial impulse of the filling jet is needed in order for the diesel fuel to spread throughout the power unit. Diesel will pass through the lubrication complex, flow out of the drain. This will eliminate the most serious contaminants and residues of used oil.
  • Close the oil pan drain cover.
  • Pour diesel into the engine. Pour as much diesel fuel as you usually pour lubricants.
  • Run the engine for a short time to run it in boost mode.
  • Make sure that the internal combustion engine does not warm up to operating temperature.
  • Turn off the motor.
  • Remove the drain cover.
  • Drain the diesel. If you notice that the mud particles come out with the last drops of diesel fuel, repeat the washing.
  • When clean diesel fuel starts flowing from the drain, close the lid.
  • Remove the temporary oil filter.
  • Install a new oil filter for further operation of the vehicle.
  • Fill with fresh oil.
  • Check the power unit for leaks.
  • Might be interesting: How does a gearbox flush work?

    If you did everything correctly, then the washing can be considered complete.


    When flushing an internal combustion engine with a diesel engine, a small nuance must be taken into account. Diesel fuel is not as thick as grease, unable to provide the necessary adhesion of spare parts.

    Due to this, the engine may not start on the first try when washing. There's nothing wrong with that, that's how it should be. Just try to start your own vehicle's powertrain again.

    Now drivers can use different flushes to clean the internal combustion engine of the car, but they are quite aggressive. Flushing the engine with diesel is considered much gentler. This method has been used for many years and has proven its effectiveness.

    Someone might think that washing an internal combustion engine with diesel fuel is possible only if the unit is diesel. This is wrong. It doesn't matter what kind of engine. Diesel fuel equally effectively flushes engines of any type, while not damaging motor parts.