In the last 150 years, motor oil has undergone tremendous change, evolving side-by-side with the engine itself. Valvoline™ has helped to keep the world moving since we introduced our motor oil way back in 1866, and we’ve been reinventing it ever since.

On December 1, 2016, motor oil is taking another step forward with the introduction of a new performance category for heavy-duty diesel engines. This new category, until now referred to as Proposed Category 11 or PC-11, is in response to national emissions standards implemented to encourage engine manufacturers to design the next generation of clean, fuel-efficient vehicles.

So as the diesel engine evolves, diesel engine lubricants must evolve too.

Designed to allow diesel engines to work longer and harder, PC-11 oils are expected to provide better protection and fuel economy compared to API CJ-4 oils currently used in heavy-duty diesel engines.

PC-11 was developed with three primary considerations:

  • Enhanced fuel economy with engines designed to run with lower viscosity fluid
  • Oxidation stability
  • Shear stability

As the 11th evolution of its kind, PC-11 is a necessary improvement, providing better protection for current engines, while making advancements in engine technology possible.

proven, tested
Red Cummins diesel engine

Starting in 2017, the Environmental Protection Agency (EPA) and the National Highway Traffic Safety Administration (NHTSA) will require heavy-duty engine manufactures to meet stricter regulations to improve fuel efficiency and cut carbon pollution.

One of the best ways engine manufacturers will meet these standards is to design hotter burning engines, which are more fuel-efficient and produce less emissions. Other changes include:

  • Smaller, more powerful engine designs
  • Tighter clearances
  • Smoother surface finishes
  • Advanced combustion

Both API CK-4 and API FA-4 feature upgrades in additive chemistry, leading to increased oxidation stability, shear stability and aeration control.

Since API FA-4 oils have lower HTHS viscosity, there is less resistance on moving parts in engines that are designed to operate with these oils, resulting in improved fuel economy.

    Common API CK-4 oil viscosity grades:
  • SAE 15W-40
  • SAE 10W-30
  • SAE 5W-40
  • SAE 5W-30
    Common API FA-4 oil viscosity grades:
  • SAE 10W-30
  • SAE 5W-30
PC-11 Cummins Engine Testing