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

A bottle of Octane Supreme fuel treatment placed on an engine in a garage, with a red vintage car in the background.

Your engine was born in the era of leaded petrol.
We bring that era back.

That’s why we created Octane Supreme, Australia’s only genuine Tetraethyl Lead additive.
It brings back the protection, smoothness, and performance that unleaded fuel simply can’t provide.

Extend Fuel life, stop fuel going off
Fuel station icon inside a map 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
Icon of a laundry detergent bottle with a droplet symbol on it.

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.

LEARN MORE
Vintage red convertible car parked at MG Car Club event with other classic cars and spectators under a white tent
A vintage black Cadillac parked in a parking lot during daytime with people in the background near a McDonald's and oz design furniture store.
A vintage dark red pickup truck parked in a parking lot near a modern building during sunset.
Interior of a vintage car showing black leather seats, wooden steering wheel, and dashboard with classic gauges.
A vintage white station wagon parked on a paved surface in front of a wooden fence, with a hedge and open field in the background under a partly cloudy sky.
A vintage green Holden car on display at a car show, with a license plate reading 'HOLDEN' and a sign in the windshield, situated in an indoor parking area.
White vintage station wagon parked on a driveway with green bushes and trees in the background.
Three vintage cars parked on grass in front of a Ford sign that reads Broadmeadows Assembly Plant, with a blue building and cloudy sky in the background.
A black vintage car with a roof cover parked in a garage, with automotive and racing signs on the wall behind it.
A vintage black Cadillac parked in a driveway in front of a house with a garage. The car has chrome accents and white-wall tires, with a garden bush to its right.
Orange vintage car parked in a parking lot during sunset, with palm trees and buildings in the background.
A vintage red Chevrolet car parked on a driveway next to a house, with a hedge on the left and an open garage on the right.
Vintage blue MG car with racing number 46 at an outdoor car show under a white tent with MG Car Club banner, alongside other classic cars.
A vintage maroon car parked inside a modern showroom with several other luxury cars, large glass windows letting in natural light, and vintage racing posters on the wall.
Three vintage cars parked in a row next to a sidewalk with residential buildings in the background, featuring a white pickup truck in the foreground and two other classic cars behind it.

Trusted by enthusiasts, racers and daily drivers, Octane Supreme delivers the same protection and performance your engine was designed for

So you can drive with confidence and keep history alive.

A black plastic bottle labeled "Octane Supreme Fuel Treatment" with a blue and red label, warning "Caution Flammable" and "Danger: Harmful or Fatal if Swallowed."

Octane Supreme Fuel Additive

Protects valves, prevents engine knock, and restores the performance your classic engine was built for.

from $35.00
Larner Engines Historic Race Car & Engine Specialists
Warren Heath Performance logo with text about race car prep and fabrication
Logo for LINK Performance for race minis and group N race cars