Rislone Radiator Stop Leak Concentrate 325ml

Use When You Notice…

• Coolant level dropping with no visible external leak: A silent internal weep drains your system quietly — this concentrate deposits a seal precisely where pressure escapes before engine damage sets in.
• Temperature gauge creeping up in stop-and-go traffic: Long Mumbai or Delhi commutes with 20–30 minute idling sessions drain cooling capacity fast — act before the gauge hits red.
• White crusty or damp patches under the front of the car: Mineral-rich Indian tap water leaves scale marks as coolant seeps — seal the source before a small weep becomes a costly radiator replacement.
• Heater blowing lukewarm air in winter: A slow heater core leak reduces heat transfer efficiency — this product seals minor heater core weeps and restores cabin warmth.
• Cooling system topped up repeatedly with tap water: Hard water accelerates scale and rust buildup inside passages — the scale dissolvers in this formula help clear blockages and restore flow.

Key Benefits

• Overheating Protection: Formulated to protect engines operating in 45°C+ ambient temperatures — directly relevant to north and central Indian summers.
• Fast Leak Sealing: Seals radiator, heater core and water jacket weeps progressively over one to two heat cycles without dismantling the cooling system.
• Scale and Rust Removal: Dissolves mineral scale from Indian hard water use, clearing restricted coolant passages and improving flow rate.
• Corrosion Inhibition: Protects aluminium radiators and engine water jackets — essential as modern BS6 engines increasingly use aluminium components.
• Universal Coolant Compatibility: Works alongside all standard coolant formulations — no need to drain and refill before adding.

The Technology Inside

Rislone Radiator Stop Leak Concentrate combines sealing particles, corrosion inhibitors and scale-dissolving agents in a single concentrated formula. The sealing particles are engineered to remain suspended in circulating coolant and deposit only where pressure loss occurs — preventing over-sealing of normal passages. Corrosion inhibitors form a protective film on aluminium and copper surfaces, combating electrochemical corrosion that is accelerated by untreated or hard water. Scale dissolvers break down calcium and magnesium deposits — the primary minerals found in Indian municipal water supplies — restoring coolant flow without abrasive mechanical cleaning. The result is a cooling system that maintains optimal thermal regulation even under the high heat-soak conditions created by Indian city traffic and extreme ambient temperatures.

Dosage & Coverage

One 325ml bottle treats a standard passenger vehicle cooling system of approximately 8–12 litres capacity — covering most Indian cars including hatchbacks, sedans and compact SUVs. Add directly to the coolant reservoir or radiator as per label instructions, always with the engine fully cool and without exceeding the maximum fill line. For best results, use every 12 months or whenever a slow leak or scale buildup is suspected.

Compatibility

Safe to use with

• All coolant colours — green, pink, blue and orange formulations
• Aluminium, copper, brass and plastic radiators and engine water jackets
• Petrol, diesel and CNG vehicles — including BS6-compliant models
• Maruti Suzuki, Hyundai, Tata, Honda, Mahindra, Toyota and Kia 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 replacement for a cracked or physically damaged radiator
• Not intended for use in racing or high-performance closed-circuit cooling systems

Why It Matters in India

Radiator and cooling system failures are among the top causes of roadside breakdowns in India, particularly across Rajasthan, Madhya Pradesh and Maharashtra during the April–June heat peak. Indian vehicles frequently run on tap water top-ups rather than distilled water, accelerating scale buildup that quietly reduces cooling efficiency over thousands of kilometres. BS6-era engines run hotter and tighter tolerances make early intervention with the best coolant leak sealer even more important. Addressing a minor weep with Rislone before it becomes a workshop job can save thousands of rupees and prevent permanent engine damage on a highway far from the nearest authorised service centre.

How To Use

1. Ensure the engine is completely cool before removing the radiator or reservoir cap.
2. Shake the bottle well and pour the full contents into the coolant reservoir or radiator.
3. Replace the cap, start the engine and allow it to reach normal operating temperature.
4. Check coolant level and monitor temperature gauge over the next two to three heat cycles.

Safety Note: Never open a radiator cap on a hot engine — scalding coolant under pressure can cause serious burns. Always work on a fully cooled engine and wear gloves when handling coolant products.

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, pink, blue and orange types. Simply add it directly to the existing coolant without draining the system first.

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

This product helps dissolve existing scale caused by hard water, but always top up your cooling system with distilled or demineralised water going forward to prevent new deposits. Using tap water repeatedly will eventually undo the benefits of any cooling system treatment.

Is it safe for BS6 petrol and diesel engines?

Yes — Rislone is formulated to be safe with the aluminium-heavy cooling systems used in modern BS6 vehicles. It does not contain sodium silicate or aggressive sealants that can damage aluminium water jackets or narrow BS6 coolant passages.

How often should I use Rislone Radiator Stop Leak?

For preventive maintenance, one treatment per year alongside your coolant flush is sufficient for most Indian driving conditions. If you have an active slow leak, treat as soon as symptoms appear and monitor over the following heat cycles.

Is Cash on Delivery available and how fast is delivery?

Yes — naredi.in offers Cash on Delivery across India with free shipping on all orders. Most metro cities including Delhi, Mumbai, Bengaluru and Hyderabad receive orders within 2–4 business days.

Complete Your Kit

For a fully protected cooling system, pair this stop leak concentrate with these two Rislone products:

• Rislone Radiator 10 Minute Flush (41211): Flush out old, contaminated coolant and dissolved scale before adding fresh coolant — especially important if your system has been running on tap water or aged coolant for more than two years.
• Rislone Hy-Per Cool Super Coolant (41300): Reduces coolant operating temperature by improving heat transfer efficiency — the ideal companion for Indian summer driving where ambient temperatures regularly exceed 45°C.

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