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 liquid concentrate deposits a seal exactly 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 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.
• Heater blowing lukewarm air in winter: A slow heater core leak reduces heat output — this product seals micro-weeps in the heater circuit without stripping the dashboard.
• Cooling system topped up repeatedly with untreated tap water: Hard water accelerates scale buildup inside passages — the scale dissolvers in this formula restore flow before blockage causes overheating.

Key Benefits

• Overheating Protection: Keeps coolant circulating efficiently even at ambient temperatures of 45°C+, reducing the risk of engine seizure on Indian highways and city roads.
• Fast Leak Sealing: Active sealing particles target radiator weeps, hose joints and heater core leaks within one to two heat cycles — no garage required.
• Scale & Rust Removal: Dissolves mineral deposits left by Indian hard water, clearing restricted coolant passages and improving heat transfer across the radiator core.
• Corrosion Inhibition: Forms a protective film on aluminium engine water jackets and copper radiator tubes, extending component life in high-humidity monsoon conditions.
• Universal Coolant Compatibility: Safe with every standard coolant colour and OAT/HOAT formulation — no need to drain before adding.

The Technology Inside

Rislone Radiator Stop Leak Concentrate uses a dual-action formula combining fibrous sealing particles with corrosion inhibitors and scale dissolvers. The sealing particles remain suspended in coolant until they reach a leak point, where pressure differential causes them to compact and form a durable plug — a process engineers call pressure-differential deposition. Meanwhile, chelating agents attack calcium and magnesium scale left by hard tap water, breaking deposits loose so the water pump can flush them out. A supplemental coolant additive (SCA) package then lays down a protective passivation layer on aluminium and ferrous metal surfaces, slowing electrolytic corrosion that accelerates in India's high-temperature, high-humidity climate. The result is a cooling system that flows freely, seals quietly and resists breakdown across extreme seasonal swings from 48°C summer peaks to monsoon-season cold starts.

Dosage & Coverage

One 325 ml bottle treats a standard passenger car cooling system of 4–8 litres capacity — covering the majority of Indian hatchbacks, sedans and compact SUVs. Add directly to the coolant reservoir or radiator (engine fully cool, never above the maximum level mark) and allow the product to circulate over one to two normal heat cycles. For heavily scaled or high-mileage systems, a prior flush with Rislone Radiator 10 Minute Flush is recommended before adding this concentrate.

Compatibility

Safe to use with

• All coolant colours — green, pink, blue and orange (OAT and HOAT formulations)
• Aluminium, copper, brass and plastic radiators and engine water jackets
• Maruti Suzuki, Hyundai, Tata, Honda, Mahindra, Toyota, Kia and MG cooling systems
• BS6-compliant petrol and diesel engines
• Rubber hoses, seals and gaskets — will not swell or degrade

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 permanent substitute for a structurally damaged or heavily corroded radiator
• Not for use in dry cooling systems — always ensure minimum coolant is present before adding

Why It Matters in India

Radiator and cooling system failures are among the leading causes of roadside breakdowns in India, particularly across Rajasthan, UP and Maharashtra during April–June when ambient temperatures regularly touch 48°C. Indian vehicles also accumulate mineral scale faster than those in temperate climates because tap water — commonly used to top up coolants — carries high calcium and magnesium loads. BS6 engines run leaner and hotter than their predecessors, making a healthy cooling system non-negotiable. Addressing a minor leak or scale blockage early with a best-in-class coolant leak sealer like Rislone costs a fraction of a workshop radiator replacement or, worse, an engine rebuild after a highway overheat.

How To Use

1. Park on level ground and wait until the engine is completely cool before touching the radiator or reservoir cap.
2. Shake the bottle well and pour the full 325 ml into the coolant reservoir or directly into the radiator — do not exceed the maximum level mark.
3. Replace the cap securely, start the engine and allow it to reach normal operating temperature so the product circulates fully.
4. Check coolant level and leak status after two to three normal driving cycles and top up coolant if required.

Safety Note: Never open a radiator cap on a hot engine — escaping steam causes serious burns. Always use gloves and safety glasses when handling coolant additives.

Frequently Asked Questions

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

Yes — Rislone Radiator Stop Leak Concentrate is compatible with all standard coolant formulations including green, pink, blue and orange types. You do not need to drain and refill your system before adding it, which makes it a genuinely practical best radiator sealant for everyday Indian car owners.

Will hard Indian tap water cause problems after I use this product?

The formula contains scale dissolvers that address existing mineral deposits, but for long-term cooling health always top up with distilled or demineralised water — available at most petrol stations and auto accessory shops. Continuing to use untreated tap water will eventually rebuild scale deposits that restrict coolant flow.

Is this safe for my BS6 Maruti or Hyundai?

Yes — this product is fully safe for BS6-era aluminium engines and is compatible with the OAT and HOAT coolants typically factory-filled in Maruti Suzuki, Hyundai, Tata and Honda vehicles sold in India after 2020. It will not interfere with your vehicle's emission control systems or PUC certificate.

How often should I use Rislone Radiator Stop Leak?

As a corrective treatment, one bottle per cooling system service interval or whenever a slow leak or overheating tendency is noticed is sufficient. For preventive maintenance in high-mileage vehicles operating in extreme heat or heavy traffic, it can be added once a year at the start of summer.

Is Cash on Delivery available and how long does delivery take?

Yes — naredi.in offers Cash on Delivery and free shipping across India. Most orders are delivered within 3–5 business days depending on your location, including tier-2 and tier-3 cities.

Complete Your Kit

For best results, pair this stop leak with these complementary Rislone cooling system products available on naredi.in.

• Rislone Radiator 10 Minute Flush (41211): Flush out old scale, rust and contaminated coolant before adding the stop leak — essential for high-mileage Indian vehicles with years of hard-water deposits blocking the radiator core.
• Rislone Hy-Per Cool Super Coolant (41300): A wetting-agent additive that lowers coolant surface tension for up to 30% better heat transfer — the ideal follow-up product to prevent overheating in Indian summer heat after sealing is complete.

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