Würth Engine Flush 400ml – Front of tin showing product label, ideal for cleaning and maintaining petrol and diesel engines.

Würth Engine Flush 400ml – Back of tin with usage instructions and directions for application.

Würth Engine Flush 400ml – Back of tin showing hazard symbols and chemical content details for safe handling.

Würth Engine Flush & Cleaner 400ml – Internal Engine & Oil System Treatment

£7.90

Würth Engine Flush 400ml delivers a quick and gentle engine clean, restoring performance and improving efficiency in petrol and diesel engines.

Deep Cleaning Action – Removes sludge, dirt, and deposits from the engine interior
Protects Seals – Gentle formula that won’t damage engine seals
Improves Emissions – Optimises exhaust gas output for cleaner performance
Frees Piston Rings – Loosens jammed piston rings for smoother operation
Easy Application – Add directly to warm oil before oil and filter change

Maintain your engine’s performance with Würth Engine Flush today.

Description
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Description

Würth Engine Flush – Internal Engine Cleaner – 400ml

Würth Engine Flush 400ml is a high-performance internal cleaner suitable for all petrol and diesel engines. It effectively removes dirt, sludge, and deposits from inside the engine and oil system. When combined with clean oil, it ensures optimal engine performance and long-lasting reliability. Perfect for routine maintenance in automotive workshops and garages. For even better results in petrol engines, pair it with the Würth Petrol Additive Performance Improver or Würth Octane Booster to boost efficiency and fuel quality. Diesel users can enhance combustion and performance by using Würth Diesel Performance Improver alongside this engine flush. Explore more in our Treatments category.

Key Features

Powerful Cleaning Action – Breaks down sludge, carbon, and varnish deposits
Safe for Engine Components – Gentle formula that won’t harm seals or metal parts
Emission Optimisation – Improves exhaust gas performance
Frees Moving Parts – Loosens jammed piston rings and improves efficiency
Simple to Use – Add to oil before draining for a complete internal clean

Why Use Würth Engine Flush?

Enhanced Performance – Restores power and smooth engine operation
Extended Engine Life – Reduces wear caused by contaminants
Improved Fuel Efficiency – Allows cleaner oil to circulate freely
Reliable Maintenance – Ideal for use before every oil change

Application and Instructions

To use Würth Engine Flush 400ml, add the contents to the warm engine oil. Let the engine idle for around 10 minutes to allow the formula to circulate and dissolve build-up. Then, change the oil and filter as normal. Avoid use in motorcycles with oil bath clutches that share a joint oil circuit. For related options, view our Oils & Lubricants.

Technical Specifications

Specification	Value
Contents	400 ml
Chemical Basis	Aliphatic hydrocarbon
Smell/Fragrance	Characteristic
Density	0.825 g/cm³
Min. Flash Point	62 °C
Shelf Life	24 Months from production
Compatibility	Petrol and diesel engines