Rislone 4405 – ZDDP Zinc Additive for Flat-Tappet Engines

Use When You Notice…

• Running a classic Ambassador, Bullet, or Mahindra Jeep on modern oil: Today's API SN/SP oils carry far less ZDDP than engines built for sliding-tappet designs require — this additive closes that gap.
• Freshly rebuilt flat-tappet engine during break-in: The first few hundred kilometres are when cam lobes are most vulnerable; extra ZDDP forms a sacrificial film before surfaces fully seat.
• Ticking valve train or increased top-end noise: Metal-on-metal contact at the camshaft is often the cause — restoring zinc levels can slow further wear.
• Your engine oil does not meet the zinc level your classic engine needs: If the oil data sheet shows below 1,200 ppm zinc, this is the corrective top-up your engine requires.
• Modified or performance engine with aftermarket flat-tappet camshaft: Aggressive cam profiles generate higher contact pressures that only a high-ZDDP oil or dedicated zinc additive can handle safely.

Key Benefits

• Sacrificial Anti-Wear Film: Forms a tenacious ZDDP layer on cam lobes and lifters, preventing costly metal-to-metal contact that leads to expensive camshaft rebuilds.
• Restores Zinc to Correct Levels: Compensates for low ZDDP in modern oils, bringing your sump back to the 1,200+ ppm that flat-tappet engines were originally designed to run on.
• Extreme Heat Resistance: Remains effective when Indian summer ambient temperatures hit 42–48°C and under-bonnet temperatures exceed 100°C in city traffic.
• Friction Reduction: Lowering valve-train friction improves throttle response and measurably reduces heat generated within the top end.
• Universal Oil Compatibility: Works with mineral, semi-synthetic, and full-synthetic oils — no special base oil required, trusted by Indian mechanics and workshops nationwide.
• Cost Prevention: A single bottle costs a fraction of a camshaft replacement on a vintage, irreplaceable engine — insurance that pays for itself on the first oil change.

The Technology Inside

Rislone 4405 delivers a concentrated zinc dialkyldithiophosphate (ZDDP) anti-wear package — the same chemistry that engine builders have relied upon since the early days of high-performance camshaft design. Under heat and pressure, ZDDP molecules decompose at the metal surface to form a glassy, sacrificial tribofilm on cam lobes and flat-tappet lifters, absorbing asperity-level contact stress before it can score the base metal. Modern API SN, SP, and BS6-aligned engine oils have had their phosphorus content reduced to protect catalytic converters — a necessary compromise for new roller-cam engines, but a serious shortfall for older sliding-contact valve trains. Rislone 4405 targets that shortfall directly, adding back the zinc-phosphorus reservoir your engine's original design specification assumed would always be present. The result is measurably lower wear rates at the most thermally stressed surfaces in your engine.

Dosage & Coverage

One 325 ml bottle of Rislone 4405 is formulated to treat a standard 4–5 litre engine sump — the typical capacity of most Indian petrol and diesel passenger vehicles. Add the full bottle at each oil change for continuous flat-tappet protection; refer to the bottle dosage chart if your sump capacity differs. Do not exceed the recommended dose — excessive phosphorus over time can affect catalytic converter function on vehicles that retain their original catalyst.

Compatibility

Safe to use with

• Petrol and diesel flat-tappet engines in classic and vintage vehicles.
• Mineral, semi-synthetic, and fully synthetic engine oils of any SAE grade.
• Classic Hindustan Ambassador, Royal Enfield Bullet (cast-iron barrel models), Mahindra CJ series Jeeps, and Heritage Fiat 1100.
• Modified or performance engines running aftermarket flat-tappet camshafts.
• High-mileage Maruti, Hyundai, Tata, and Honda engines with older flat-tappet architecture.

Not suitable for

• Modern roller-cam engines where ZDDP levels in standard oil are already sufficient — unnecessary supplementation wastes money.
• Cannot repair already scored or physically damaged cam lobes — worn metal must be machined before this additive can protect what remains.
• Not a replacement for correct viscosity-grade engine oil; always use the manufacturer-specified base oil first.

Why It Matters in India

India's roads combine brutal stop-start city traffic in Delhi, Mumbai, and Bengaluru with ambient summer temperatures of 42–48°C — conditions that degrade engine oil faster than the temperate climates most oil formulations were benchmarked against. High dust levels accelerate oil contamination, shortening the window during which your oil's original ZDDP content remains active. Indian owners typically keep vehicles 10–15 years, and the classic car community — Ambassadors, old Bullets, vintage Jeeps — is growing rapidly. For these engines, a best zinc oil additive like Rislone 4405 is not optional; it is the difference between another decade of reliable service and a workshop bill that exceeds the vehicle's market value.

How To Use

1. Ensure your engine is at normal operating temperature, then switch off and allow five minutes to cool.
2. Shake the Rislone 4405 bottle well, then pour the full 325 ml directly into the engine oil filler cap.
3. Replace the filler cap, start the engine, and allow it to idle for five minutes to distribute the additive.
4. Check the dipstick oil level and top up with fresh engine oil to the correct mark if needed.

Safety Note: Keep away from children. In case of skin contact, wash thoroughly with soap and water. Dispose of empty bottle responsibly at an authorised waste collection point.

Frequently Asked Questions

Will the extra zinc in Rislone 4405 damage my catalytic converter?

Used at the recommended single-bottle dose, the incremental increase in phosphorus is unlikely to cause measurable catalyst damage under normal driving conditions. Problems arise only with significant and repeated over-dosing — stick to the bottle chart and your catalyst is safe.

My oil is already labelled "classic car" or "racing" grade — do I still need this?

Check the technical data sheet for the actual zinc (Zn) concentration; if it already exceeds 1,200 ppm, additional supplementation is unnecessary. Many oils carry the classic label for marketing reasons but do not publish ZDDP figures — if in doubt, adding Rislone 4405 at the correct dose is the safer choice for flat-tappet engines.

Is Rislone 4405 safe for BS6-compliant vehicles registered in India?

BS6 engines use modern roller-follower valve trains that do not require elevated ZDDP — this product is intended specifically for older flat-tappet architectures. If your BS6 vehicle has a classic or modified flat-tappet engine fitted, use only the recommended dose to stay within safe phosphorus limits.

How often should I add Rislone 4405 to my engine?

Add one bottle at every engine oil change — typically every 5,000–7,500 km for mineral oil users in Indian conditions, or as specified by your mechanic. Because ZDDP depletes alongside the base oil, topping up at each oil change maintains consistent camshaft protection throughout the service interval.

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

Yes — naredi.in offers Cash on Delivery across India with free delivery on all orders. Most metro orders (Delhi, Mumbai, Bengaluru, Chennai, Hyderabad) arrive within 2–4 business days; Tier 2 and Tier 3 cities typically receive orders within 4–6 business days.

Complete Your Kit

Pair Rislone 4405 with these complementary Rislone treatments for complete engine protection on your classic or high-mileage vehicle.

• Rislone Engine Treatment Conditioner and Cleaner (44102): Cleans sludge and varnish deposits from ageing engines before you introduce fresh ZDDP protection — removing internal contamination means the zinc additive reaches clean metal surfaces where it bonds most effectively.

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