Liqui Moly Engine Flush Plus engine oil system cleaner 300ml — dissolves sludge & varnish

Liqui Moly Engine Flush Plus is a 300ml chemical treatment that loosens and removes sludge, varnish, and deposits from the engine oil system before an oil change.

Designed for use in gasoline and diesel engines, this concentrated formula is added to warm engine oil and run briefly before draining. It helps mobilize contaminants trapped in galleries, oil pump areas, valve train zones and oil coolers so they are removed with the used oil rather than remaining to contaminate fresh lubricant. The product is compatible with modern engine materials and is intended to be used as part of routine maintenance, especially when signs of oil contamination, reduced oil pressure or long oil-change intervals are present.

How does Liqui Moly Engine Flush Plus clean the oil system?

The formula contains detergents and dispersants that break up sludge and dissolve varnish without aggressive mechanical action. Once added to warm oil and run for the recommended short period, the loosened deposits stay suspended and are removed when the oil is drained.

• Concentrated 300ml dose treats typical passenger-car oil capacities.
• Active ingredients dissolve varnish and loosen sludge particles.
• Suspends contaminants so they drain out with used oil.
• Safe for seals and common engine materials when used as directed.

When should I use an engine flush like this?

Use before an oil change when oil appears dark or contaminated, after extended service intervals, before switching oil types, or when preparing a used engine for sale to show cleaner oil flow. It’s not intended for continuous or repeated long-term use.

• Prior to changing oil to remove accumulated deposits.
• After prolonged high-mileage intervals or heavy idling use.
• Before converting to a different viscosity or synthetic oil.
• When troubleshooting low oil pressure caused by sludge buildup.

How do I use the 300ml bottle correctly and safely?

Add the contents to warm, but not hot, engine oil while the engine idles. Run the engine at idle for the time specified on the bottle, then drain the oil and replace the oil filter. Follow vehicle manufacturer guidance and the product label for exact steps and safety precautions.

• Add to warm engine oil with engine idling.
• Run for the recommended short interval (see label).
• Drain oil and replace the oil filter immediately after use.
• Dispose of used oil and flush residue per local regulations.

Who is this for: Liqui Moly Engine Flush Plus 300ml suits car owners and professional technicians who want a targeted, single-dose treatment to remove oil-system deposits before an oil service. It is ideal for vehicles with visible oil contamination, engines returning from extended intervals, or anyone preparing an engine for a fresh lubricant type. Avoid use in engines with known severe leaks or mechanical damage without professional inspection. Always follow the vehicle manufacturer's recommendations and the product label for safe, effective use.