- Motul Radiator Stop Leak 300ml – Cooling System Leak Sealer for Petrol & Diesel Engines
Seal Minor Cooling System Leaks & Protect Your Engine from Coolant Loss
Motul Radiator Stop Leak 300ml is a professional cooling system treatment designed to quickly seal minor leaks in radiators, heater cores, hoses, cylinder head gaskets (minor seepage), water pumps, and cooling system connections without disassembling the engine.
Its advanced sealing formula circulates with the coolant, locating small leaks and forming a durable seal where coolant is escaping. At the same time, it helps maintain cooling system efficiency, reduces coolant loss, and protects your engine from overheating caused by minor leaks.
Suitable for all liquid-cooled petrol and diesel engines, Motul Radiator Stop Leak is compatible with most types of antifreeze and coolants, making it an ideal preventive maintenance and emergency repair solution.
Key Features
- Quickly seals minor radiator and cooling system leaks
- Helps prevent coolant loss
- Protects against engine overheating caused by coolant leakage
- Seals small leaks in radiators, hoses, heater cores, water pumps, and cooling system joints
- Compatible with most coolant and antifreeze types
- Safe for aluminum, copper, brass, steel, and plastic cooling system components
- Helps extend cooling system reliability
- Easy-to-use, pour-and-go formula
- Suitable for petrol and diesel engines
- Ideal for preventive maintenance and emergency use
Ideal For
Motul Radiator Stop Leak is recommended for:
- Passenger cars
- SUVs
- Pickup trucks
- Petrol engines
- Diesel engines
- Hybrid vehicles with liquid-cooled engines
- Turbocharged vehicles
- Commercial vehicles
- Motorcycles with liquid-cooled engines
Compatible with:
- Organic Acid Technology (OAT) coolant
- Hybrid Organic Acid Technology (HOAT) coolant
- Conventional antifreeze
- Long-life coolant formulations
Benefits
Small coolant leaks can gradually lead to coolant loss, reduced cooling efficiency, and engine overheating if left untreated. Repairing these leaks often requires significant time and expense.
Motul Radiator Stop Leak provides a fast and effective solution by sealing minor leaks from inside the cooling system while allowing coolant to continue circulating normally. It helps maintain proper cooling performance, reduces coolant loss, and gives added protection until permanent repairs can be carried out if necessary.
Regular inspection of the cooling system is still recommended to identify any major mechanical issues.
How to Use
- Ensure the engine is cool before opening the radiator or coolant reservoir.
- Shake the bottle well before use.
- Pour the entire bottle of Motul Radiator Stop Leak 300ml into the radiator or expansion tank.
- Start the engine and allow it to reach normal operating temperature with the heater set to maximum.
- Let the engine idle for approximately 10–15 minutes to circulate the product throughout the cooling system.
- Check the coolant level after the engine has cooled and top up with the correct coolant if required.
Recommended Usage: Use only when minor coolant leaks are detected or as a temporary preventive solution before professional repair.
