Engine Sludge
Engine sludge is a thick, tar-like deposit that forms when oil breaks down and mixes with contaminants.
What is Engine Sludge?
It builds up under valve covers, in the sump and in oil passages. Long oil change intervals, short trips and overheating encourage it. Coolant in the oil can create a creamy sludge.
How it works
Oxidised oil, moisture, fuel and soot form deposits that block oil flow.
Why it matters for your car
Sludge can starve bearings and the turbocharger of oil. Milky deposits under the oil cap can come from condensation on short trips, but persistent deposits should be investigated.
Other terms
- Anti-roll Bar Link (Drop Link)
- Asymmetric Tyres
- Battery Passport (EU)
- Battery Thermal Management
- Crank But No Start
- European Accident Statement
- Fuel Pressure Regulator
- Immobilizer
- Interior Light
- Limp Mode (Emergency Mode)
- Naturally Aspirated Engine
- NOx (Nitrogen Oxides)
- SCR (Selective Catalytic Reduction)
- Serpentine Belt (Auxiliary Belt)
- Steering Play (Free Play)
- Sunload Sensor (Solar Sensor)
- Surround View Camera (360-degree Camera)
- Three-Cylinder Engine
- Trolley Jack (Floor Jack)
- Underbody Protection