Update- January, 2018: We now sell Briggs & Stratton/AMSOIL 4T Synthetic Racing Oil in Canada. 

AMSOIL and Briggs & Stratton have teamed up to develop a state-of-the-art synthetic racing oil for 4-cycle small engines. We now offer the result of this joint venture: Briggs & Stratton/AMSOIL 4T Synthetic Racing Oil (for sale in USA only, see below for explanation). This product can be used in any four-stroke, air-cooled competition engine for karting, quarter midget and junior drag racing.

Four-Stroke Racing Engine Challenges

Briggs & Stratton/AMSOIL 4T Synthetic Racing OilExtreme Heat

Engines such as the Briggs Animal, World Formula and Raptor can wreak havoc on motor oil. These are air-cooled engines that are operated at over 10,000 rpm and depend on the engine oil to handle a considerable portion of the cooling duties. Lesser oils tend to shear down and lose viscosity under extreme heat and heavy loads. The 4T Synthetic Racing Oil formula is designed to not only withstand the extreme heat, it’s synthetic makeup will reduce heat build-up and resist viscosity breakdown. It also reduces oil loss through heat vaporization.


Briggs racing engines such as the Animal series do not utilize a pressurized oil system so they depend upon “splash” lubrication. Oil is essentially “flung” around the inside of the engine to provide oil distribution. Oil being hurled about can create air bubbles in the oil and this is known as “foaming”. The problem with foaming is that as the air bubbles are drawn into tight tolerances, they burst and leave this area prone to metal-to-metal contact. Briggs/AMSOIL 4T Racing Oil is formulated with a powerful anti-foaming additives to alleviate this risk.

Anti-Rust & Corrosion

Racing engines can sit idle for long periods between competitions and during the off-season. 4T Racing Oil is fortified with anti-corrosion additives to keep engine internals like new.

Why is Briggs/AMSOIL 4T Synthetic Racing Oil Not For Sale in Canada?

For now, this product is not being offered in Canada as AMSOIL is measuring demand to see if they can justify bilingual labeling. Until such time that they create Canadian labels, they cannot ship to Canada. If you are interested in this product, let us know and we will gladly pass this along and hopefully kick-start the process.

A synthetic racing oil developed for 4-stroke, air-cooled kart engines. Resist high heat and foaming, while maximizing horsepower output.
Brand: Briggs & Stratton
Manufacturer: AMSOIL
Model: 4T Synthetic Racing Oil
Product ID: GBS2960