Rislone 41211

Use When You Notice…

• Drained coolant looks brown or smells burnt: Rust and deposit build-up have contaminated the system — this radiator flush liquid removes that contamination before fresh coolant goes in.
• Temperature gauge creeping up in stop-go city traffic: Blocked radiator tubes from mineral scale reduce heat transfer exactly when your engine needs cooling most — in Delhi or Mumbai traffic queues.
• System has run on tap water for years: Hard Indian tap water deposits calcium and scale that quietly reduce heat transfer — a fast radiator flush clears it out before the damage shows.
• Switching to a premium coolant or Rislone Hy-Per Cool: A clean system lets new coolant perform to its full specification from day one, protecting your investment.
• High-mileage vehicle never flushed before: Older Maruti, Hyundai and Tata vehicles often carry years of accumulated scale — a single 10-minute flush can meaningfully restore cooling efficiency.

Key Benefits

• Rapid Deep Cleaning: Dissolves rust particles, calcium scale and oil-based deposits from radiator tubes and engine water jackets in a single 10-minute flush cycle.
• Restored Coolant Flow: Clears blocked passages to help your cooling system operate at full capacity — essential protection in Indian summer ambient temperatures of 42–48°C.
• Safe on All Radiator Materials: Non-acidic alkaline chemistry is gentle on aluminium, copper and plastic components common in modern BS6 Indian vehicles.
• Prevents Overheating Damage: Removing scale before it thickens protects cylinder heads and gaskets — rejuvenates aging engines without costly workshop repairs.
• Trusted by Indian Mechanics: Workshops across India recommend a periodic radiator flush as the most affordable way to extend engine life in Indian driving conditions — heat, dust, stop-go city traffic.

The Technology Inside

Rislone 41211 uses a non-acidic alkaline surfactant system that penetrates and lifts rust oxides, calcium carbonate scale and hydrocarbon deposits from internal cooling surfaces during a controlled 10-minute flush cycle. Unlike acid-based cleaners, the alkaline pH actively neutralises acidic corrosion by-products without attacking base metals — particularly important for the thin-walled aluminium radiators found in modern Maruti Swift, Hyundai i20 and Tata Nexon cooling systems. The formula targets the biofilm and mineral fouling layer that forms when hard tap water is used repeatedly — a common cleaner meaning in the context of cooling-system chemistry. Once the deposits are loosened and suspended in solution, the entire mixture drains away cleanly, leaving bare metal surfaces ready to bond with fresh corrosion-inhibiting coolant.

Dosage & Coverage

One 355 ml bottle of Rislone 41211 treats a standard passenger-car cooling system of up to 10–12 litres capacity — covering most Indian hatchbacks, sedans and compact SUVs. Add the full bottle to a water-filled cooling system, run the engine for the 10-minute cycle as per bottle directions, then drain, rinse and refill with fresh coolant. For best results in Indian conditions, repeat every 2–3 years or at every coolant change interval.

Compatibility

Safe to use with

• Aluminium, copper-brass and plastic radiators in passenger cars and light commercial vehicles.
• All petrol, diesel and CNG engines — including BS6-compliant vehicles.
• Suitable for high-mileage Maruti, Hyundai, Tata, Honda, Toyota and Mahindra engines.
• Compatible with all ethylene glycol and OAT-based coolants when used as directed.

Not suitable for

• Not formulated for heavy-duty commercial truck radiators with very large coolant volumes — use a dedicated heavy-duty flush for those applications.
• Not a long-term additive — always drain and flush completely before refilling with coolant; do not leave in the system.
• Cannot repair physically cracked radiator tanks or pinhole leaks — see Rislone Radiator Stop Leak for those situations.

Why It Matters in India

Most Indian households and roadside mechanics top up cooling systems with untreated municipal tap water rather than distilled water, causing calcium and mineral scale to accumulate inside radiator tubes season after season. Combined with dust levels in Indian cities and stop-start traffic in Bengaluru or Pune, this scale build-up pushes engines dangerously close to overheating thresholds during May–June peak summer. A 10-minute radiator flush liquid cycle before each coolant change is an easy, affordable practice that protects BS6 engines — where aluminium components are more prevalent and more sensitive to corrosion — and is already standard practice in trusted Indian workshops and service centres.

How To Use

1. Ensure the engine is cool, then drain the old coolant completely from the radiator.
2. Fill the cooling system with clean water and pour in the full bottle of Rislone 41211.
3. Start the engine and let it idle for 10 minutes to circulate the radiator cleaner liquid.
4. Drain completely, flush with clean water twice, then refill with fresh coolant to the correct level.

Safety Note: Always allow the engine to cool fully before opening the radiator cap. Wear gloves and eye protection when handling coolant and flush liquid. Dispose of drained fluid responsibly — do not pour into drains or open ground.

Frequently Asked Questions

Can I use Rislone 41211 on a very old or fragile radiator?

Yes — the formula is non-acidic and specifically designed to be gentle on aged radiator metals. That said, if your radiator is severely corroded with visibly thin or damaged tubes, a professional inspection before flushing is advisable so you know what condition the system is in beforehand.

How often should I flush my radiator in Indian conditions?

Every 2–3 years, or at each coolant change — whichever comes first. If your vehicle has been running on tap water rather than distilled water, we recommend flushing sooner, as mineral scale accumulates faster under those conditions.

Is this safe for BS6 vehicles with aluminium engines?

Absolutely. The non-acidic alkaline chemistry will not attack the aluminium alloy components used in BS6 petrol and diesel engines. It is one of the reasons Rislone 41211 is widely recommended for modern Indian vehicles alongside older ones.

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

Yes — naredi.in offers Cash on Delivery and free shipping across India. Most metro orders arrive within 3–5 business days; Tier 2 and Tier 3 cities typically receive orders within 5–7 business days.

Can this be used before adding DEF (def in diesel) systems or other additives?

Rislone 41211 is a cooling-system product only and has no interaction with DEF in diesel exhaust after-treatment systems. Always flush the cooling system fully and refill with fresh coolant before adding any other coolant-circuit additives.

Complete Your Kit

For complete cooling-system protection, pair Rislone 41211 with these trusted Rislone products available on naredi.in.

• Rislone Hy-Per Cool Super Coolant (41300): Add to fresh coolant after flushing to dramatically improve heat transfer and reduce running temperatures — ideal for Indian summer driving where ambient heat reaches 48°C.
• Rislone Radiator Stop Leak Concentrate (41196): If a minor seep or weep develops after flushing, this concentrate seals small leaks in radiator tubes and hoses without harming the cooling system.
• Rislone Liquid Aluminum Stop Leak (41186): Purpose-formulated for aluminium radiators and water pumps common in modern Maruti, Hyundai and Tata vehicles — stops leaks fast and is safe for all cooling-system materials.

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