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Oil Sludge Flush by LIQUI MOLY

SKU: 5200

BARCODE: 4100420052002

PRODUCT TYPE: Oil Additives



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The perfect solution for cleaning the engine from the inside. Removes black sludge and other contaminants and deposits. Increases the operational reliability of the engine and prevents lubrication deficiency. Gently cleans oil holes, oil screens, piston ring grooves and ducts and prevents engine damage.

Suitable for all commercially available motor oils in gasoline and diesel engines with and without a diesel particulate filter (DPF). Tested for use with turbochargers and catalytic converters. Add approx. 200 km before the oil change. Contents sufficient to treat up to 5 litres of motor oil. Can be safely used in vehicles with a timing belt running in oil. Not suitable for motorbikes with a wet clutch.


Special highly effective combination of oil-soluble detergents and thermally stable dispersants for rapid and easy removal of black sludge and other combustion products from the engine and crankcase. The combustion chamber of a gasoline engine contains fuel and air and, after ignition and combustion, completely or partially burnt residues. Most of the combustion products escape through the exhaust system but a small proportion pass into the crankcase as blow-by gas and thus into the motor oil. Partially burnt fuel has poor oil solubility and contributes to the formation of sludge and lacquers on the metal surfaces. In the presence of oxygen, nitrogen and heat, the lubricating oil forms insoluble oxidation products which also contribute to the formation of sludge and deposits. With diesel engines, sulfur is also carried into the combustion chamber where it is converted to SO2 and SO3 during combustion and forms sulfurous and sulfuric acids together with the water which is produced from the combustion of the fuel/air mixture. These products, which initially reside in the piston rings area with the soot and low-molecular oxidized fuel residues (even there having a detrimental effect on the engine), are carried downwards with the blow-by gases or motor oil into the crankcase where they form deposits and lacquers or cause rust and wear.


- Reduces deposits
- Removes black sludge
- Cleans oil ducts, holes and screens
- Simple to use
- Prevents expensive repairs
- Economical
- Prevents lubrication deficiency
- Prevents the agglomeration of combustion products


Base: Additive, Trägerflüssigkeit / additives and carrier fluid
Colour / appearance: braun / brown
Flash point: 63 °C
Pour point: -35 °C
Odor: charakteristisch / characteristic
Form: flüssig / liquid
Viscosity at 40 °C: 38 mm²/s
Density at 15 °C: 0,887 g/cm³


Used especially for dealing with sludge in all areas of gasoline and diesel engines. Can be safely used in vehicles with timing belt running in oil.


One 300 ml can is sufficient for engines with oil capacities of up to 5 liters. After adding the product drive as usual for about 200 km, but avoid full-throttle operation. Then change the motor oil and oil filter. Repeat the cleaning process in cases of extreme contamination. Clean the oil screen in the oil sump if necessary. Can be used before each oil change.

Not suitable for use on motorbikes with wet clutches.



All orders are sent on to our order processing team within 24 hours of the order being placed. This team usually then take from between 1 - 3 working days to process and dispatch your shipment. continue reading


Once we have completed the processing stage of your order and dispatched your item(s), standard delivery on average takes from between 3 - 5 working days to arrive to you while express delivery takes from between 1 - 3 working days to arrive to you. continue reading

SHIPPING COSTS offer free standard delivery on all orders over £50. For orders under £50 we charge a flat rate standard delivery fee of £4.99 per order. For express delivery we charge a flat rate delivery fee of £9.99 per order. Shipping upgrades where available can be purchased in the ‘shipping’ section on cart page when completing your purchase.


All orders are shipped with a fully trackable delivery service. Tracking information will be sent to you by email once your order has been successfully dispatched.


We currently do not offer an international shipping service to addresses outside of the United Kingdom. This is something we are working on and hopefully will be able to offer in the not so distant future. Apologies for any inconvenience this may cause you.

View our full shipping policy here: Shipping policy


We offer a 28 day return policy from the point of sale. If 28 days have gone by since your purchase we unfortunately cannot accept your return.

To be eligible for a return items must be returned and received back at our warehouse within 28 days from the point of sale. All returning item(s) must be sent back in the same condition and packing they were received in; items must also be unused, unopened and adequately packaged. We retain the right to withhold a portion of the total refund amount and / or cancel a return if the above return requirements are not met.

View our full return policy here: Return policy


LM Performance is the authorised distributor of Liqui Moly products in the UK, supplying the motorsports, vehicles tuning, classic car, marine sports and high-performance vehicle sectors with the extensive range of oils, additives and workshop chemicals made in Germany.

The company is arranging exclusive opportunities for motorsport engine builders, vehicles preparers, competitors, organisers and championship providers to promote the use of Liqui Moly oils and additives in the most extreme and competitive conditions.

LM Performance is happy to provide full technical assistance in conjunction with Liqui Moly from their state-of-the-art laboratories in Germany.

We wish all of our family of customers great success in all forms of motorsport.

We hope you enjoy our products and service offering as much we enjoy using the products ourselves.

If you have any questions, comments or concerns please feel free to get in contact with our friendly customer service team who will be delighted to assist you.

Robb Gravett - CEO

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Oil Sludge Flush by LIQUI MOLY

Oil Sludge Flush by LIQUI MOLY