Rislone Radiator Stop Leak Concentrate 325ml

Use When You Notice…

• Coolant level drops slowly with no obvious external leak: A silent internal weep drains your system — this auto radiator stop leak deposits a seal precisely where pressure escapes.
• Damp or white crusty patches under the front of the car: Mineral-rich Indian tap water leaves scale marks as coolant seeps — seal the source before it becomes a costly failure.
• Temperature gauge creeping upward in stop-and-go traffic: Even a tiny coolant loss cuts cooling capacity dangerously during long Mumbai or Delhi commutes in 42–48°C heat.
• Heater blowing lukewarm air in winter: A slow heater core weep reduces hot coolant flow to the cabin — sealing it early avoids an expensive replacement.
• Cooling system repeatedly topped up with untreated tap water: Hard water accelerates scale and rust buildup — treating the system now prevents blocked passages later.

Key Benefits

• Rapid leak sealing: Reactive particles seal small radiator and heater core leaks within one to two heat cycles — no draining required.
• Overheating prevention: Maintains full coolant volume so your engine stays protected even during 30-minute traffic jams in Indian summer heat.
• Scale and rust removal: Dissolves mineral deposits left by hard Indian tap water that restrict coolant flow through narrow radiator passages.
• Corrosion protection: Inhibitor package shields aluminium engine water jackets and copper radiator cores from electrochemical corrosion — a known issue in BS6 engines.
• Universal coolant compatibility: Works safely alongside green, pink, blue and orange coolant formulations without causing gel or precipitation.

The Technology Inside

Rislone Radiator Stop Leak uses fine reactive sealing particles suspended in a liquid carrier that circulate freely through healthy passages but activate on contact with escaping coolant at a leak point. Unlike bulk sodium silicate sealers, these particles are sized to seal micro-fractures and weep joints without clogging water pump bearings or narrow heater core tubes. The formula also contains organic acid technology (OAT) compatible corrosion inhibitors that form a protective film on aluminium and copper surfaces — the metals most commonly attacked in modern Indian engines running on hard, untreated water. A scale-dissolving component targets calcium and magnesium carbonate deposits, the residue left when Indian municipal tap water is used as a coolant top-up. The result is a cleaner, more efficient cooling circuit that maintains design flow rates even in congested city conditions.

Dosage & Coverage

One 325ml bottle treats a standard passenger car cooling system of 4–8 litres capacity — covering most Maruti, Hyundai, Tata and Honda models. Add the entire bottle directly to the coolant reservoir or radiator as directed on the label; never exceed the maximum level mark. Use as needed when symptoms appear; for preventive protection in high-mileage vehicles, one treatment per year before the Indian summer season is recommended.

Compatibility

Safe to use with

• All coolant colours — green, pink, blue and orange OAT, HOAT and IAT formulations
• Aluminium, copper, brass and plastic radiators and engine water jackets
• Petrol, diesel and mild-hybrid engines including BS6-compliant vehicles
• Maruti Suzuki, Hyundai, Tata, Honda, Mahindra, Toyota and Ford cooling systems

Not suitable for

• Mechanical failures — does not fix a failed thermostat, water pump or fully blown head gasket
• Large visible radiator cracks or burst hoses — physical repair is required first
• Cooling systems with active coolant contamination (milky oil) — consult a mechanic immediately

Why It Matters in India

Radiator leaks and cooling failures are among the top causes of roadside breakdowns on Indian highways, peaking between April and June when ambient temperatures reach 48°C in north and central India. Stop-and-go city traffic in Delhi, Mumbai and Bengaluru forces engines to idle for 20–30 minutes at a stretch — a cooling system operating even slightly below capacity will overheat. Monsoon temperature swings from June to September further stress rubber seals and gaskets, opening new weep points. Addressing small leaks early with the best coolant stop leak available prevents the catastrophic overheating events that cause permanent engine damage far from the nearest workshop.

How To Use

1. Allow the engine to cool completely before opening any radiator or reservoir cap.
2. Check current coolant level and ensure it is below the maximum mark.
3. Pour the entire 325ml bottle into the coolant reservoir or radiator opening.
4. Run the engine for 15–30 minutes and monitor the temperature gauge for improvement.

Safety note: Never open a hot radiator cap — pressurised coolant can cause severe scalding. If the temperature gauge enters the red zone, pull over safely and allow the engine to cool before inspecting.

Frequently Asked Questions

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

Yes — Rislone Radiator Stop Leak is compatible with all standard coolant formulations including green IAT, pink and blue OAT, and orange HOAT types. Simply add it to whatever coolant is already in your system without draining first.

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

The formula helps dissolve existing scale from hard water, but you should always top up with distilled or demineralised water going forward to prevent new mineral deposits. Using hard tap water repeatedly will undo the benefits over time and restrict coolant flow.

Is this safe for BS6 engine cooling systems?

Yes — the corrosion inhibitor package is compatible with the aluminium-heavy cooling systems found in modern BS6 petrol and diesel engines. It will not affect sensors, EGR coolers or any other emission-related cooling components.

How quickly will I see results?

Most small leaks seal within 15–30 minutes of running the engine after adding the product. For older weeps or heater core seepage, allow one to two full heat cycles for the reactive particles to fully deposit at the leak point.

Is Cash on Delivery available and how fast is delivery?

Yes — naredi.in offers Cash on Delivery across India with free delivery on all orders. Most orders are dispatched within 24 hours and delivered within 3–5 business days depending on your location.

Complete Your Kit

For a fully protected Indian cooling system, pair this stop leak with these Rislone companions:

• Rislone Radiator 10 Minute Flush (41211): Use before adding stop leak to flush out scale, rust and old coolant residue — gives the sealing particles a clean system to work in.
• Rislone Hy-Per Cool Super Coolant (41300): Reduces coolant operating temperature by up to 10°C — the ideal follow-up treatment to maintain safe temperatures during Indian summer months and traffic jams.

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