Rislone Radiator Stop Leak Concentrate 325ml

Use When You Notice…

• Temperature gauge climbing in slow traffic: Delhi, Mumbai and Bengaluru jams mean 20–30 minutes of idling — sealing particles and conditioners keep coolant flowing safely.
• Coolant level dropping with no visible puddle: A slow internal hairline leak loses coolant invisibly over days — this concentrate activates on contact to close the gap without a workshop visit.
• White residue or rust inside the reservoir: Hard Indian tap water leaves mineral scale that restricts flow and corrodes aluminium radiators — this product actively dissolves those deposits.
• Overheating warning light flickering in summer: Ambient temperatures of 42–48°C in May–June push cooling systems to their limits — act before permanent engine damage occurs.
• Cooling system topped up repeatedly with tap water: Untreated tap water accelerates scale build-up over time — use this concentrate to restore protection and flow.

Key Benefits

• Overheating Protection: Formulated to protect engines in 45°C+ Indian summer conditions where standard coolant alone may not be sufficient.
• Best Radiator Sealer Action: Seals minor cracks and hairline leaks in the cooling circuit without requiring a complete coolant flush or system drain.
• Scale and Rust Removal: Dissolves hard-water mineral deposits and rust that block radiator passages — a common issue across Indian cities with high-TDS tap water.
• Corrosion Inhibition: Protects aluminium radiators, engine water jackets and copper components from electrochemical corrosion.
• Universal Coolant Compatibility: Works with all coolant formulations — no need to drain before adding.

The Technology Inside

Rislone Radiator Stop Leak Concentrate combines synthetic sealing particles, corrosion inhibitors and scale dissolvers engineered to work inside a live cooling circuit. The sealing particles are heat-activated — they remain inert in solution but form a durable seal when they contact air or moisture at a leak point, a process known as differential pressure sealing. Scale dissolvers use chelation chemistry to break down calcium and magnesium carbonate deposits — the exact mineral compounds left behind by hard Indian tap water. Corrosion inhibitors then coat exposed metal surfaces, including aluminium, copper and brass, to prevent future oxidation. The formula is designed to be safe with OAT, HOAT and IAT coolant types — all three of which are found across BS6-compliant Indian vehicles today.

Dosage & Coverage

One 325ml bottle treats a standard passenger car or SUV cooling system of 4–8 litres capacity — covering the majority of Maruti Suzuki, Hyundai, Tata, Honda and Mahindra models on Indian roads. Add directly to the coolant reservoir or radiator as per label instructions — always with the engine completely cool and never above the maximum level mark. The product works progressively over one to two heat cycles; check coolant level again after the first full drive cycle.

Compatibility

Safe to use with

• All coolant colours and formulations — green, pink, blue and orange.
• Aluminium, copper, brass and plastic radiators and engine water jackets.
• BS6-compliant petrol and diesel engines including turbocharged variants.
• Compatible with Maruti Suzuki, Hyundai, Tata, Honda and Mahindra cooling systems.

Not suitable for

• Does not fix overheating caused by a failed thermostat, faulty water pump or blown head gasket — these require mechanical repair.
• Not a permanent solution for large or structurally damaged radiator cracks.

Why It Matters in India

Radiator and cooling system failures are among the top causes of roadside breakdowns in India, particularly across north and central India during summer. Indian city traffic — especially in Delhi, Mumbai and Bengaluru — forces engines to idle for extended periods with no airflow across the radiator, pushing coolant temperatures dangerously high. Combine this with the hard water used in most Indian households when topping up radiators and the result is scale-blocked passages that reduce cooling efficiency year on year. Addressing minor leaks and scale build-up early with a product like this, suitable for Indian conditions — extreme heat, heavy traffic, hard water — prevents the overheating events that cause permanent engine damage far from a workshop.

How To Use

1. Ensure the engine is completely cool before opening the radiator cap or reservoir.
2. Shake the bottle well and pour the full 325ml into the coolant reservoir or radiator.
3. Replace the cap securely, start the engine and run it to normal operating temperature.
4. Check coolant level and temperature gauge behaviour after the next two full drive cycles.

Safety Note: Never open a radiator cap on a hot engine — pressurised coolant can cause serious burns. If overheating persists after use, consult a qualified mechanic immediately.

Frequently Asked Questions

Can I use this with any coolant colour?

Yes — Rislone Radiator Stop Leak Concentrate is compatible with all standard coolant formulations including green, pink, blue and orange types. There is no need to drain or flush the system before adding the product.

Is this safe for BS6 engines in Maruti Suzuki, Hyundai and Tata vehicles?

Yes — the formula is safe with the aluminium engine components and OAT/HOAT coolant types used in BS6-compliant vehicles. It has been formulated specifically for modern cooling systems found in popular Indian cars and SUVs.

Will hard Indian tap water cause problems after using this?

This product will dissolve existing scale caused by hard water, but always top up your cooling system with distilled or demineralised water going forward to prevent fresh mineral deposits. Mixing with untreated tap water will reduce the product's long-term effectiveness.

How often should I use this product?

One application per year is sufficient for preventive maintenance, or use immediately when symptoms such as rising temperature gauge or dropping coolant level appear. For heavily scaled older systems, a Rislone Radiator Flush beforehand will improve results significantly.

Is Cash on Delivery available and how quickly will it arrive?

Yes — naredi.in offers Cash on Delivery across India with free delivery on all orders. Most orders are delivered within 3–5 business days depending on your location.

Complete Your Kit

For best results, pair this concentrate with these Rislone products for a complete cooling system service:

• Rislone Radiator 10 Minute Flush (41211): Use this before adding the stop leak concentrate — it clears heavy scale, old coolant residue and rust from the system so the sealer and inhibitors can work on clean surfaces.
• Rislone Hy-Per Cool Super Coolant (41300): Add this after sealing leaks to actively lower coolant operating temperature by up to 10°C — essential protection for Indian summer driving and extended traffic idling in cities.

Warranty & Support in India

• Warranty: 1-year warranty against manufacturing defects
• Customer Support: Monday–Saturday, 9 AM–6 PM IST. WhatsApp / Phone: +91 93112 11157 · hello@naredi.in
• Returns: 14-day return and exchange policy, COD returns accepted
• Delivery: Free delivery across India, Cash on Delivery available