A black plastic bottle of octane Supreme fuel treatment with blue, red, and white label.

Octane Supreme Fuel Additive

500mL Bottle

(NOT to be used in engines fitted with exhaust sensors and catalytic converters)

Turn your unleaded fuel back into real leaded petrol with Octane Supreme.

This is the genuine Tetraethyl Lead (TEL) formula, not to be compared with substitutes or “lead replacements.” Protects valves, prevents engine knock, and restores the performance your classic engine was built for. Perfect for vintage cars, motorcycles, race engines, and stationary motors running designed to run on leaded fuel. Safe, reliable, and trusted.

See the table below for recommended dosage rates

from $35.00

We offer local shipping to Metro Melbourne, or you can purchase from one of our stockists.

If you are located interstate, please get in touch, and we can arrange shipping for you.

Bring Back Real Leaded Fuel — The Way It Was Meant to Be.

Leaded petrol may be gone, but your classic engine still depends on it. Octane Supreme is Australia’s only genuine Tetraethyl Lead (TEL) fuel additive, the original formula your engine was built for. As the exclusive authorised supplier, we bring back the true leaded fuel experience that no substitute or “lead replacement” can match.

Designed for classic cars, vintage motorcycles, race engines, and stationary motors, Octane Supreme protects valve seats, prevents knock, and restores smooth, powerful performance.

Trusted by enthusiasts across Australia, it’s the safe, proven, and authentic way to keep your engine running at its best, preserving performance, protecting your investment, and keeping automotive history alive.

Classic cars displayed at an MG Car Club event, including a red convertible in the foreground and a black coupe behind, with people browsing under a white tent labeled 'MG CAR CLUB'.

Why Your Classic Engine Needs Octane Supreme

Modern unleaded fuels were never designed for classic engines. They lack the vital Tetraethyl Lead (TEL) that older motors depend on, and without it, critical engine problems can develop over time:

  • Valve Seat Recession – Without the lead’s protective layer, valve seats wear rapidly, shortening engine life.

  • Detonation & Knock – Unleaded fuel can cause damaging pre-ignition in high-compression engines.

  • Loss of Power & Smoothness – Performance, throttle response, and drivability all decline compared to original leaded petrol.

  • Dirty Spark Plugs – Modern fuels leave behind deposits that cause fouling and unreliable ignition.

  • Fuel Stabiliser – Unleaded petrol goes stale over time, losing volatility and causing hard starts.

Octane Supreme fixes all of this. By reintroducing genuine Tetraethyl Lead, it:

  • Restores the protection and lubrication your engine was built for.

  • Boosts octane by 1–5 points, reducing knock and improving power.

  • Keeps spark plugs clean, ensuring smooth hot and cold starts.

  • Acts as a fuel stabiliser, keeping stored fuel fresh for months.

With Octane Supreme, you’re not just protecting your engine, you’re restoring the performance, sound, and feel of real leaded petrol, exactly as your classic was meant to run

Key Benefits

Icon of a speedometer gauge with the needle pointing to the middle.
Map icon with a gas pump inside a location marker.

Powerful Octane Boost

Increases octane by 1 to 5 points, reducing knock and improving performance.

Extends Fuel Life

Acts as a stabiliser to keep fuel fresh in storage.

Black circle with two white water droplet icons inside
Black background with a white bottle of liquid dish soap or detergent with a teardrop shape on the label.

Keeps Spark Plugs Clean

Helps prevent fouling and ensures reliable hot and cold starts.

Restores True Leaded Fuel

Turns unleaded back into authentic leaded petrol.

A black table with white text displaying instructions for different fuel applications, including dosage, octane boost points, and bottle treats quantity for street use, performance, and race use.

Dosage Guide