Engine Flush
An engine flush is a cleaning additive poured into the old oil shortly before an oil change to loosen deposits.
What is Engine Flush?
It runs at idle for a few minutes and is then drained with the old oil. It is sold as a way to remove sludge and varnish from neglected engines. Many manufacturers do not require it in normal maintenance.
How it works
Strong detergents and solvents dissolve deposits so they leave with the drained oil.
Why it matters for your car
In heavily sludged engines, loosened deposits can block the oil pickup screen; check the manufacturer's guidance first. Regular oil changes with the right oil are the best way to prevent deposits in the first place.
Other terms
- ACEA Oil Specification
- Acoustic Vehicle Alerting System (AVAS)
- Brake Dust
- Brake Pressure Sensor
- European Accident Statement
- Fuel Additive
- Fuel Pump Relay
- Gearbox Warning Light
- Lumbar Support
- Multi-link Suspension
- Plug-in Hybrid (PHEV)
- Precharge Circuit
- Reinforced Tyres (XL, Extra Load)
- Remanufactured Parts
- Roundabout
- Stratified Charge Combustion
- Two-Post Lift (Vehicle Lift)
- Valve Spring
- Vehicle Registration Document
- Windscreen (Windshield)