Rislone Radiator Stop Leak Concentrate 325ml

Use When You Notice…

• Coolant level dropping with no visible external leak: A silent internal weep quietly drains your system — this concentrate deposits a seal exactly where pressure escapes before engine damage sets in.
• Temperature gauge creeping up in stop-and-go traffic: Long Delhi or Mumbai commutes with 20–30 minutes of idling drain cooling capacity fast — act before the needle hits red.
• White crusty or damp patches under the front of the car: Mineral-rich tap water leaves scale marks as coolant seeps — seal the source before a small weep becomes a costly radiator replacement.
• Cooling system topped up repeatedly with untreated tap water: Hard water accelerates scale and rust buildup inside passages — this product dissolves existing deposits and protects against new ones.
• Engine running hotter than usual during monsoon temperature swings: Seasonal pressure changes stress cooling seals — one dose keeps your system tight through the rains.

Key Benefits

• Overheating Protection: Guards your engine against heat damage in 45°C+ Indian summer conditions — the #1 cause of engine failure in north and central India from April to June.
• Fast Coolant Leak Repair: Seals minor radiator, hose joint and heater core leaks progressively over one to two heat cycles, saving an unplanned workshop visit.
• Scale and Rust Removal: Dissolves mineral deposits caused by Indian hard water, restoring full coolant flow through blocked radiator passages.
• Corrosion Inhibition: Protects aluminium radiators and engine water jackets — critical in BS6 vehicles that use lightweight aluminium cooling components.
• Universal Coolant Compatibility: Works with all standard coolant colours and formulations — no draining or flushing required before adding.

The Technology Inside

Rislone Radiator Stop Leak Concentrate uses a dual-action formula combining sealing particles and corrosion inhibitors that activate under system pressure and heat. The sealing agents migrate toward leak points in the radiator, hose joints and water jacket, depositing a stable, pressure-resistant seal without clogging the thermostat or water pump impeller. Scale dissolvers — technically chelating agents — break down calcium and magnesium carbonate deposits left by hard water, which is a persistent problem across Indian cities where tap water TDS regularly exceeds 500 ppm. The corrosion inhibitor package is specifically formulated to protect the mixed-metal cooling systems found in modern Indian engines, including aluminium cylinder heads, copper-brass radiators and plastic reservoir tanks. The result is a cooling system that flows freely, seals tight and resists corrosion through every Indian season.

Dosage & Coverage

One 325ml bottle treats a standard 4–6 litre passenger car cooling system — the typical capacity of Maruti Suzuki, Hyundai, Tata and Honda models sold in India. Add directly to the coolant reservoir or radiator as per the label instructions — always with the engine completely cool and never above the maximum level mark. For best results, run the engine through two full heat cycles and re-check coolant level; repeat every 12 months or at each coolant service interval.

Compatibility

Safe to use with

• All coolant colours — green, blue, pink and orange OAT and HOAT formulations
• Aluminium, copper, brass and plastic radiators and engine water jackets
• BS6-compliant Maruti Suzuki, Hyundai, Tata, Honda and Mahindra cooling systems
• Both petrol and diesel passenger vehicles and light commercial vehicles

Not suitable for

• Does not fix overheating caused by a faulty thermostat, failed water pump or blown head gasket — these require mechanical repair
• Not a substitute for a full coolant flush when the system is heavily contaminated or rusty
• Not intended for heavy-duty truck or bus cooling systems without consulting Rislone dosage guidelines

Why It Matters in India

Radiator and cooling system failures are among the top causes of roadside breakdowns in India, particularly in north and central India during peak summer. Indian city traffic — especially in Delhi, Mumbai and Bengaluru — forces engines to idle for 20–30 minutes at a stretch, pushing coolant temperatures dangerously high in already-stressed systems. Add hard tap water and high ambient temperatures of 42–48°C to the mix and even a small, ignored coolant weep can escalate to a seized engine on a highway far from the nearest workshop. Addressing minor leaks early with a product designed for Indian conditions is the most cost-effective engine protection decision an Indian car owner can make.

How To Use

1. Park on level ground and allow the engine to cool completely before opening any cooling system cap.
2. Check the current coolant level and do not exceed the maximum fill mark on the reservoir.
3. Pour the recommended dose of Rislone directly into the coolant reservoir or radiator filler neck.
4. Run the engine to normal operating temperature and monitor the temperature gauge over the next two heat cycles.

Safety Note: Never open the radiator cap on a hot engine — scalding coolant under pressure can cause serious burns. Always wear gloves when handling coolant additives.

Frequently Asked Questions

Can I use this product with any coolant colour already in my car?

Yes — Rislone Radiator Stop Leak Concentrate is compatible with all standard coolant formulations including green, blue, pink and orange. There is no need to drain or flush before adding, making it suitable for Indian conditions where vehicles often have mixed coolant histories.

Will Indian hard tap water cause problems after using this product?

The product's chelating agents will dissolve existing scale from hard water use, but going forward always top up with distilled or demineralised water to prevent new deposits. Hard water with high TDS — common across Delhi, Rajasthan and Maharashtra — is one of the fastest ways to block a radiator and reduce cooling efficiency over time.

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

Yes — Rislone is fully compatible with the aluminium-heavy cooling systems used in modern BS6 vehicles. It will not harm gaskets, seals, plastic tanks or any OEM cooling components found in current-generation Indian passenger cars.

How often should I use Rislone Radiator Stop Leak Concentrate?

One application lasts up to 12 months under normal use or until your next scheduled coolant service. If your vehicle operates in extreme conditions — heavy summer traffic, high-altitude routes or frequent towing — consider reapplying at each coolant flush interval.

Is Cash on Delivery available and how quickly will it be delivered?

Yes — naredi.in offers Cash on Delivery (COD) and free delivery across India. Most orders are dispatched within 1–2 business days and delivered within 4–7 working days depending on your location.

Complete Your Kit

For a complete cooling system service, pair Rislone Radiator Stop Leak Concentrate with these two essential Rislone products available on naredi.in.

• Rislone Radiator 10 Minute Flush (41211): Use this before adding the stop leak concentrate to clear out sludge, old scale and contaminated coolant — essential if your system has been running on tap water for multiple seasons.
• Rislone Hy-Per Cool Super Coolant (41300): Reduces coolant operating temperature by up to 11°C — the ideal companion product for Indian summers and heavy city traffic where the cooling system is under constant thermal stress.

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