Manufacturers have stepped up their technology efforts to meet rigorous fuel-efficiency and emissions standards. In doing so, many next-generation engines will need higher-performing diesel engine oils to protect them. This requires changes in engine oil composition to withstand more heat without sacrificing engine protection.
A new generation of diesel engine oils was rolled out in December 2016. One of those oils is CK-4, a high-temperature, high-shear (HTHS) oil that can be used in both new and existing engines. It is available in the same viscosity grades and oil types currently being used in fleet operations.
According to the American Petroleum Institute (API), CK-4 can be used in high-speed, four-stroke-cycle diesel engines designed to meet 2017 model-year on-highway and Tier 4 non-road exhaust emission standards, as well as previous model-year diesel engines.
As much as possible, minimize exposure between new and old engine oils to ensure the benefits of CK-4 as well as continued OEM warranty support, advised Mark Betner, heavy-duty product line manager for CITGO (www.citgo.com).
A second oil type that debuted in December – FA-4 – has limited backward compatibility and is better suited for 2017 model-year engines and beyond. This “low-HTHS” oil is offered in lower viscosity grades and is not recommended for use with fuels having greater than 15 parts per million sulfur, according to API (www.api.org).
What Are the Benefits?
Benefits of the new CK-4 and FA-4 oils include increased fuel economy and lower emissions.
“Lower-viscosity engine oils will improve fuel economy and reduce greenhouse gases over [previous] engine oils,” Betner said. “FA-4 engine oils in an FA-4-compliant engine will offer even greater fuel economy and reduce greenhouse gases.”
In addition, “Today’s lighter weights can deliver the equivalent or even better wear protection than a CJ-4 15W-40 oil, along with significantly improved oil drain performance,” according to Len Badal, global Delo brand manager for Chevron Lubricants (www.chevronlubricants.com).
Betner agreed, noting the advanced technology of these two engine oils provides significant improvements in deposit control, shear stability and oil aeration control. “These engine oils will also have a 60 percent better oxidation resistance compared to API CJ-4, which aids in extended service intervals,” he explained.
Badal mentioned that off-road equipment would reap significant rewards from CK-4. “CK-4 oils deliver many benefits that directly address major issues with off-road equipment, including extended drain intervals, reduced engine wear and ability to extend rebuild intervals,” he said. “Off-highway equipment operators stand to gain a lot of benefits from the new API CK-4 oils, with a direct impact on reliability, productivity and profitability.”
Based on reduced fuel consumption, and extended oil drain and engine rebuild intervals, potential cost savings are expected.
Fleets surveyed by CITGO reported improved fuel efficiency after converting to its new API CK-4 oils, with improvement ranging from 1.6 to 3.2 percent after 50,000 miles.
What’s the Next Step?
Identify the units in your fleet that will be most impacted, and always check the owner’s manual for the proper lubricant recommendation.
One particular area of concern is for fleets comprised of various makes and models. Some automakers have indicated that neither one of the new engine oils should be used in certain vehicles at this time.
Nebraska Public Power District is one utility that has been proactively addressing that issue. Matt Gilliland, NPPD’s director of transportation and facilities, said he has been communicating with internal staff and servicing vendors to address the diversity of units in the organization’s fleet.
About the Author: Grace Suizo has been covering the automotive fleet industry since 2007. She spent six years as an editor for five fleet publications and has written more than 100 articles geared toward both commercial and public sector fleets.
OEM Specs for API CK-4 and FA-4 Oils
Major diesel engine and truck manufacturers recently provided their own OEM specifications that connect with the new API CK-4 and FA-4 categories for their new model GHG 2017 diesel engines, with several also citing backward compatibility as well as upgrades to support longer oil drain intervals. These initial specs are mainly focused on CK-4 but should include more FA-4 data in the future.
Source: Len Badal/Chevron Lubricants