The New Oils: An Update on CK-4 and FA-4
Extensive engine testing of the new oils involved engine teardowns. Photo: Chevron
">Extensive engine testing of the new oils involved engine teardowns. Photo: Chevron
">Last December, for the first time, the American Petroleum Institute started licensing two different approved heavy-duty diesel engine oils. CK-4 is the new backward-compatible standard, designed to replace CJ-4. A new FA-4 category was designed to offer a lower viscosity that performed under stressful conditions to help engine makers meet fuel efficiency standards.
CK-4 adoption is going largely as expected, but very few fleets are using FA-4 yet – because very few engine makers so far are recommending it.
Currently there are close to 600 licensed CK-4 oils and about 80 FA-4 oils, according to Kevin Ferrick, senior manager of API's Engine Oil Licensing and Certification System.
CK-4 and FA-4 both have to meet the same performance standards in terms of things such as oxidation control, preventing engine wear, and protecting the aftertreatment system. They're designed to be more robust and resistant to oxidation compared to their CJ-4 predecessors, says Brian Humphrey, OEM technical liaison for Petro-Canada Lubricants. “This may mean that, with proper oil filtration, longer oil drain intervals may be achieved. They are also designed to improve resistance to aeration and have increased shear stability, which will provide enhanced performance and greater hardware protection over time.”
But FA-4 is a different viscosity, and it's limited to XW-30 grades such as 10W-30 and 5W-30. And that's to offer better fuel economy.
Steve Phillips is president of Allied Oil & Tire in Omaha, Nebraska, a 59-year-old business with significant focus on the heavy-duty commercial truck market. Nearly all of its customers have transitioned to CK-4 – but none to FA-4.
“We spent about a year with the guidance of our vendors making sure we educated our customers on what that difference was,” Phillips says. “To me it speaks volumes as far as the fuel efficiency ...Read the rest of this story