Product Description
Fuel Additive 945ml E Guard 15 - DA2910 - Tetraboost
TetraBOOST E-Guard 15 is not a substitute; it is the only additive that transforms standard unleaded petrol into genuine leaded fuel, replicating the properties of high-octane, BS4040-spec pump fuel or better. Trusted by National Motor Museums in the UK, France, and the Netherlands, as well as by renowned restoration specialists, marque experts, engine builders, and vintage racing teams, TetraBOOST has become the industry standard for enthusiasts who demand authenticity and performance.
Proven Performance for Road and Track
Whether you're touring, towing, or racing, TetraBOOST delivers the full benefits of traditional leaded fuel without the cost and inconvenience of sourcing increasingly rare leaded petrol. Even in engines with hardened valve seats, it enhances performance, reduces valve stem and guide wear, and provides smoother throttle response, improved combustion, and cooler running.
When mixed with premium unleaded fuel such as Shell V-Power, TetraBOOST can exceed BS4040 standards, producing true 5-star petrol with octane levels of 100 or even up to 106, rivaling aviation-grade fuel.
Genuine Protection, Not a Substitute
TetraBOOST contains real Tetraethyl Lead (TEL), offering unmatched protection and knock resistance far superior to substitutes based on manganese, phosphorus, sodium, or potassium. It remains essential for preventing valve seat recession in older engines and ensures long-term reliability without expensive modifications or rebuilds.
Engineered for Classic Engines
TetraBOOST is a carefully balanced solution of TEL in aromatic hydrocarbons, combined with proprietary scrubbers to create real 4- and 5-star fuel. Simply measure and add it to your fuel tank before filling with high-octane unleaded petrol. It is ideal for vehicles where fitting hardened valve seats is impractical or risky, such as pre-war Bentleys or low-mileage collector cars.
By slowing the combustion rate of modern fuels, TetraBOOST makes them more compatible with vintage engines. This results in easier starts, smoother operation, lower engine temperatures, and better fuel economy, as reported by many satisfied customers.
Safe, Legal and Convenient
While TetraBOOST is a hazardous and flammable substance, it is safe to use when handled according to instructions. It is fully legal, sold with all taxes and duties paid, and available exclusively via mail order for direct delivery to your door. Best of all, you can produce authentic 4-star fuel for approximately 20p per litre above pump price, making it a cost-effective way to preserve your engine’s legacy.