Trusted by classic car owners, racers and vintage motorcycle riders, Octane Supreme delivers the same protection and performance your engine was designed for

So you can drive with confidence and keep history alive.

Octane Supreme Fuel Additive

Octane Supreme Fuel Additive — 500mL Bottle Octane Supreme Fuel Additive — 500mL Bottle
Octane Supreme Fuel Additive — 500mL Bottle
$35.00
Limit 12 per order

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 on leaded fuel. Safe, reliable, and trusted.

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

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

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
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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.
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Larner Engines Historic Race Car & Engine Specialists
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