API CK-4, API FA-4 established two diesel engine oil specifications – one with backward compatibility for older engine technology (“CK-4”) and one for use with newer engine technology (“FA-4”).
For FA-4, the aim is to reduce greenhouse gas emissions and improve fuel efficiency. CK-4 oils are designed as direct replacements to current CJ-4 oils, offering enhancements in oxidation resistance, shear stability and aeration control.

API CK-4, API FA-4 does not change the best practices that help drive the success of owner-operators and fleets. It’s also important to note that API CK-4, API FA-4 does not affect every business in the same way.

Some owner-operators and fleets with older equipment may see only a small impact from API CK-4, API FA-4 – switching from CJ-4 oils to the enhanced CK-4 oils. In comparison, fleets with a combination of older and newer equipment may choose to stock both CK-4 and FA-4 oils until the older units are cycled out of the fleet.

Owner-operators and fleets operating newer equipment with advanced engine technology should follow original equipment manufacturer recommendations.

API CK-4, API FA-4 diesel engine oils are in market.

API CK-4, API FA-4 has a global impact, but the primary applications are in the United States, Canada and Mexico.

Changing industry standards call for vehicle and engine improvements capable of:

• Reducing carbon dioxide and greenhouse gas emissions
• Enhancing fuel efficiency
• Maintaining engine durability while improving oxidation resistance, shear stability and aeration control

These improved engine designs require commercial vehicle engine oils with performance capabilities far exceeding those of CJ-4 oils.

API CK-4, API FA-4 diesel engine oils have gone through substantial research and development, ensuring the lubricant technology meets new performance targets while improving engine wear protection. After being proven via extensive field testing, API CK-4, API FA-4 Mobil Delvac™ engine oils were announced in September 2016.

As of June 2017, we have accumulated more than 80 million kilometres of testing data on our CK-4 and FA-4 formulations. We are also now accumulating more than 2.4 million kilometres a month of additional testing data with select fleet partners. Our current field testing includes about 200 trucks.