Understanding the API
The American Petroleum Institute (API) is the leading trade association representing all aspects of the oil and natural gas industry in the United States.
Founded in 1919, it brings together key players in the sector and works to promote technical standards, public policies that support innovation, and transparent communication on energy-related issues.
Why is the heavy-duty market evolving?
Driven by EPA Phase 3 greenhouse-gas standards and the evolving demands of global OEMs, the truck and engine industries are undergoing a major shift. Modern engines will run hotter, face higher pressures, and require unprecedented levels of chemical stability.
Thermal stress
Up to +10°C higher operating temperatures. Next-generation engines (2027+) run significantly hotter to optimize combustion and reduce emissions.
Traditional oils would oxidize and thicken too fast. PC-12 delivers extreme thermal stability.
Extended durability
Zero compromise on wear. Tighter engine tolerances require a tougher oil film.
PC-12 introduces new, ultra-strict ring and liner wear tests to guarantee mechanical longevity even with thinner fluids.
Emission compliance
Protecting chemical limits. Stricter SAPS (sulfated ash, phosphorus and sulfur) control.
The oil formulation is engineered to prolong the lifespan of advanced aftertreatment systems, preventing filter clogging.
Match the pathway to your fleet
To balance the needs of existing fleets with the ultra-low viscosity requirements of future vehicles, the API PC-12 standard splits into two distinct categories. Toggle below to compare their HTHS viscosity profile.
CL-4 · Heavy Protection
Viscosity grade
HTHS limit
Backward compatibility
Best for
FB-4 · Fuel Economy
Viscosity grade
HTHS limit
Backward compatibility
Best for
Maximum fleet efficiency
Improved protection and performance for aftertreatment devices.
The next generation of heavy-duty performance
The transition is coming. Don't just react to it, lead it.
Our global R&D centers are currently formulating and field-testing a brand-new range of premium heavy-duty lubricants designed not just to meet, but to exceed the rigorous API PC-12 thresholds. By blending advanced base oils with cutting-edge additive technology, we are engineering solutions that protect your hardware today and maximize your fuel efficiency tomorrow.