Liqui Moly Pro-Line Engine Flush 500 ml, 6-Pack — Pre-Oil-Change Cleaner, Safe for Gas & Diesel

If you want to remove internal engine residues safely before replacing engine oil, this professional-grade flush is formulated for gasoline and diesel four-stroke engines. The liquid additive dissolves lacquer and sludge, helps suspend solid contaminants, and supports recovery of oil’s lubricating behavior — all without harming seals or catalytic converters. Use before an oil service for a cleaner oiling system and a better start for fresh lubricant.

How does this product clean an engine before an oil change?

The flush contains detergents and solvents engineered to break down sticky deposits and suspensions of contaminants so they can be removed with the drained oil. It works during a short run-in period, loosening buildup from oil galleries, pistons and valve train components.

• Pour into warm engine oil prior to service to activate cleaning agents.
• Run the engine at idle for about 10 minutes to circulate the formula.
• Drain contaminated oil and replace the oil filter to remove suspended particles.
• Refill with fresh engine oil compatible with your vehicle’s specifications.

Is it safe for different engine types and engine components?

Pro-Line Engine Flush is designed to be neutral to common elastomers and engine materials, making it suitable for both gasoline and diesel four-stroke engines. It’s formulated to be compatible with catalytic converters and modern seal compounds when used as directed.

• Suitable for petrol and diesel engines, including turbocharged units.
• Non-aggressive to seals and gaskets under recommended use conditions.
• Catalyst-friendly formulation for vehicles equipped with emission control systems.
• Works with all commercially available engine oils for post-flush refill.

What are the practical steps and benefits of using the flush?

Using the flush is a simple addition to a standard oil change routine that can improve oil circulation, reduce abrasive particles, and help restore engine responsiveness. The process takes little extra time but can reduce the amount of stubborn deposits left behind.

• Add one 500 ml can into the existing engine oil before service.
• Idle-run the engine for ten minutes to allow cleaning action throughout the lubrication circuit.
• Drain oil, replace filter, and top up with fresh oil to complete the service.
• Expect cleaner oil galleries and improved conditions for new lubricant performance.

How much product do I get and what packaging details matter?

This listing includes six 500 ml cans, convenient for multiple service intervals or for servicing several vehicles. The compact metal cans are easy to store in a workshop or home garage and sized for single-application dosing.

• Pack of 6 cans, each 500 milliliters, for repeat use or fleet maintenance.
• Single-can dosing simplifies measurement and eliminates pouring errors.
• Metal canisters offer durable storage and protect product integrity.
• Label includes basic usage instructions; follow manufacturer directions precisely.

Who is this for: This product is aimed at DIY mechanics, professional technicians, and fleet managers who want a reliable method to clear internal oil passages and reduce deposits before an oil change. It’s appropriate for owners of passenger cars, light commercial vehicles and small fleets that require a neutral, catalyst-compatible engine flush to help fresh oil perform optimally.