Rislone 4405

Use When You Notice…

• You own a classic or vintage vehicle with sliding flat tappets — Hindustan Ambassador, early Royal Enfield Bullet, classic Mahindra Jeep, or Heritage Fiat running flat-tappet cams that modern low-ZDDP oils leave dangerously under-protected.
• You've just rebuilt or reground your camshaft — the break-in period is the single highest-risk phase for cam lobe wear; extra ZDDP is non-negotiable.
• Tappet noise or valve-train clatter appearing at idle — early sign that cam lobes and lifters are losing their protective film and wearing against each other.
• Your modern engine oil doesn't meet the zinc level your engine was designed for — most current API SP/SN+ oils contain far less ZDDP than engines designed before 1990 require.
• Running a modified or performance flat-tappet engine — higher spring pressures accelerate cam wear when zinc levels fall short of the 1,200 ppm threshold these engines need.

Key Benefits

• Restores Critical Zinc Levels: Tops up ZDDP to the 1,200+ ppm range that flat-tappet camshafts require, compensating for what modern API-licensed oils no longer provide.
• Extreme-Heat Anti-Wear Protection: Remains chemically active when ambient temperatures hit 42–48°C and under-bonnet heat climbs well beyond 50°C — conditions Indian summers routinely produce.
• Prevents Costly Camshaft Failure: Avoids the ₹15,000–₹50,000+ camshaft and lifter rebuild bills that come from running a vintage engine on low-zinc modern oil.
• Reduces Friction Across the Valve Train: Lower operating friction translates to smoother throttle response and measurably longer engine life in high-mileage Indian vehicles.
• Trusted by Indian Mechanics and Workshops: Mechanics in Tier 2 and Tier 3 cities recommend ZDDP supplementation for any classic restoration — Rislone 4405 is the benchmark additive for this job.

The Technology Inside

Rislone 4405 delivers a concentrated zinc dialkyldithiophosphate (ZDDP) anti-wear package — the same chemistry that engine oil manufacturers reduced from their formulations to comply with modern catalytic converter and emission standards. Under the extreme contact pressure between a flat-tappet lifter and a cam lobe, ZDDP molecules decompose thermally and chemically to form a glassy, sacrificial tribofilm on the metal surfaces. This tribofilm absorbs the asperity-contact stress that would otherwise cause adhesive wear, scuffing, and eventual cam lobe failure. Unlike film-forming polymers that wash away under heat, a properly formed ZDDP tribofilm chemically bonds to the iron surface and rebuilds itself during each heat cycle — making it uniquely suited to India's long idling sessions and extreme ambient temperatures. The result is dramatically reduced metal-to-metal contact, lower friction, and a valve train that lasts the full life of the engine.

Dosage & Coverage

Add one 325 ml bottle directly to your engine crankcase at oil-change time, before or after filling with fresh oil. The 325 ml dose is calibrated for standard Indian sump capacities of 3–5 litres; refer to the bottle dosage chart if your sump is significantly larger or smaller. Repeat with every oil change, or whenever you switch to a fresh fill of modern low-ZDDP oil. Do not exceed the recommended dose — excessive phosphorus accumulation over time can gradually reduce catalytic converter efficiency.

Compatibility

Safe to use with

• Petrol and diesel flat-tappet engines of any displacement
• Mineral, semi-synthetic, and fully synthetic engine oils of any viscosity grade
• Classic and vintage vehicles: Hindustan Ambassador, Royal Enfield Bullet (pre-Unit), Mahindra CJ series, Heritage Fiat 1100
• Performance and modified engines running aggressive flat-tappet camshaft profiles with high spring pressures
• High-mileage Maruti, Hyundai, Tata, and Honda engines where valve-train wear is a concern

Not suitable for

• Modern roller-cam engines where standard oil ZDDP levels are already sufficient — unnecessary supplementation wastes product
• Engines with severely damaged or scuffed cam lobes — ZDDP prevents wear but cannot reverse existing mechanical damage
• Use beyond the recommended dose — excess phosphorus can accelerate catalytic converter degradation over extended use

Why It Matters in India

India's classic car and motorcycle community is growing rapidly — Ambassador restorers, Bullet Trials owners, and Mahindra Jeep enthusiasts all run flat-tappet engines that were engineered when engine oil routinely contained 1,500 ppm of zinc. Today's BS6-compliant engine oils, formulated to protect modern catalytic converters, carry far less ZDDP — leaving these irreplaceable engines vulnerable every time the oil is changed. Add India's stop-start Delhi and Mumbai traffic, dust-laden air that accelerates oil contamination, and peak ambient temperatures that push oil film stability to its limits, and the case for a dedicated best zinc oil additive becomes clear. Rislone 4405 bridges that gap cleanly, without requiring you to source specialist high-ZDDP oil or compromise your vehicle's emission compliance.

How To Use

1. Ensure the engine is at normal operating temperature, then switch off and allow it to cool for 10 minutes.
2. Shake the Rislone 4405 bottle well, then pour the full 325 ml into the engine oil filler cap opening.
3. Replace the filler cap, start the engine, and allow it to idle for 5 minutes to distribute the additive fully.
4. Check and top up the oil level on the dipstick to the correct mark before driving.

Safety Note: Keep away from children. Avoid skin contact and wash hands thoroughly after use. Do not use on engines with known catalytic converter damage. Dispose of the empty bottle responsibly at an authorised waste collection point.

Frequently Asked Questions

Will this ZDDP additive damage my catalytic converter?

Used at the recommended single-bottle dose, the incremental increase in phosphorus is unlikely to cause measurable harm to a healthy catalytic converter in normal Indian driving conditions. The risk arises only from chronic over-dosing — stick to one bottle per oil change and your converter is safe. If your vehicle is already due for a PUC renewal, complete that before adding any engine additive for a clean baseline reading.

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

Check the technical data sheet for that oil's actual zinc (ZDDP) concentration — if it already lists 1,200 ppm or above, additional supplementation may not be necessary. Many oils marketed as "classic" still fall below this threshold to maintain backward API compatibility, so always verify the number rather than relying on the label alone.

Is Rislone 4405 suitable for my BS6 Royal Enfield or modern Tata engine?

Modern BS6 engines use roller-follower valve trains that do not rely on ZDDP at the same contact pressures as flat-tappet designs, so supplementation is generally unnecessary for these vehicles. Rislone 4405 is specifically formulated for flat-tappet (sliding tappet) engines — if you are unsure of your engine type, ask your mechanic or check your workshop manual before adding.

How often should I add Rislone 4405?

Add one bottle at every oil change — this ensures zinc levels are replenished each time fresh, low-ZDDP modern oil is added to your engine. For classic vehicles driven seasonally or stored, add a fresh dose when you recommission the vehicle after a long lay-up period, as ZDDP depletes even when the engine is not running due to oxidation.

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

Yes — naredi.in offers Cash on Delivery across India, with free delivery to all pin codes. Most metro orders (Delhi, Mumbai, Bengaluru, Chennai, Hyderabad) are delivered within 2–4 business days; Tier 2 and Tier 3 city deliveries typically arrive within 4–7 business days. Track your order via the confirmation message sent to your registered mobile number.

Complete Your Kit

Pair Rislone 4405 with these complementary Rislone products for a complete engine protection and maintenance routine:

• Rislone Engine Treatment Conditioner and Cleaner (44102) — clears varnish, sludge, and carbon deposits from ageing engines before you add fresh oil and ZDDP protection, ensuring the additive reaches clean metal surfaces for maximum effect; an essential first step for any high-mileage classic restoration in India.

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