Engineered to outlast

the engine it protects.

On Guard formulates premium full synthetic, synthetic blend, diesel and racing lubricants — meeting and exceeding API SP GF-6 standards. Up to three times the life of conventional oil.

3x

Longer life than conventional

#5

Top Viscosity Index rating

SP GF-6

Meets or exceeds API spec

100%

American made

The Lineup

A formula for every engine.

Full Synthetic

Our flagship 100% synthetic motor oil engineered for modern gasoline engines. Meets and exceeds API SP and ILSAC GF-6 standards for fuel economy, turbocharger protection, and low-speed pre-ignition prevention. Delivers up to 3× the service life of conventional oils.

Synthetic Blend

A premium blend of synthetic and conventional base stocks for drivers who want better protection without paying full synthetic prices. Stands up to high-mileage engines and severe service driving with improved wear protection and reduced oil consumption.

Diesel Engine Oil

Heavy-duty 15W-40 formulated for hard-working diesel engines on the highway, the jobsite, and the farm. Meets API CK-4 specifications with advanced soot dispersancy, oxidation resistance, and TBN retention for extended drain intervals under load.

Racing and Performance Oils

Full synthetic 10W-40 built for V-twin, sport, and metric motorcycles with wet-clutch systems. JASO MA2 certified for consistent clutch feel and shift quality, with extreme-pressure additives that protect transmission gears and high-RPM valvetrains.

Coolant Lineup

A full line of antifreeze and coolants formulated to protect cooling system components in any climate. From universal long-life formulas to OEM-specific chemistries, every gallon delivers freeze, boil, and corrosion protection year-round.



Transmission Fluid

Full synthetic automatic transmission fluid that meets the requirements of most domestic and import automatic transmissions. Engineered for smooth shifts at any temperature, anti-shudder durability, and long-term protection of clutches, bands, and valve bodies.

Formulation Is Key

Built to a higher standard.
Priced to compete.

On Guard's state-of-the-art synthetic lubricating agents reduce bearing loads, oil drag, contamination, and unnecessary power loss. Every formulation is refined to precisely uniform molecules — cleaner composition, lower volatility, and exceptional consistency at temperature extremes.