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New PC-11 products
The launch of new Mobil Delvac diesel engine oils will help on- and off-highway fleets, fleet managers and owner/operators reach their business goals. 
The development of PC-11
Get more of the story behind PC-11. Plus, learn how the new CK-4 and FA-4 oils could help your business. 
PC-11 FAQs
There are a lot of questions surrounding the upcoming diesel engine oil specification change. Get more of the details behind PC-11 here. 

PC-11: Overview of the upcoming API specification change

The American Petroleum Institute’s (API) heavy-duty diesel engine oil category (commonly referred to as “Proposed Category 11” or “PC-11”) is designed to help reduce emissions and boost fuel economy. Imperial Oil wants you to be prepared for this industrywide change. Get all of the key facts below.


What is PC-11 all about?

The development of a new oil category

PC-11: Descripción del próximo cambio de especificación API PC-11 will establish two new diesel engine oil specifications – one with backward compatibility for older engine technology (“CK-4”) and one for use with newer engine technology

For FA-4, the aim is to reduce greenhouse gas emissions and improve fuel efficiency. CK-4 oils will be designed as direct replacements to current CJ-4 oils, offering enhancements in oxidation resistance, shear stability and aeration control.

How will PC-11 affect owner/operators and fleets?

Switching engine oils

PC-11: Descripción del próximo cambio de especificación API PC-11 will not change the best practices that help drive the success of owner/operators and fleets. It’s also important to note that PC-11 will not affect every business in the same way.

Some owner/operators and fleets with older equipment may see only a small impact from PC-11 – switching their current 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.

When will PC-11 arrive?


PC-11: Descripción del próximo cambio de especificación API The first release date is December 2016, although it’s likely that owner/operators and fleets may not see the new diesel engine oils until early 2017.

Where will PC-11 be applied?

North America

PC-11: Descripción del próximo cambio de especificación API There will be a global impact to PC-11, but the primary applications will be in the United States, Canada and Mexico.


Why do we need a new oil specification?

Emissions and fuel efficiency standards

PC-11: Descripción del próximo cambio de especificación API

New industry standards are calling 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 will require commercial vehicle engine oils with performance capabilities far exceeding those of current CJ-4 oils.

How are the two new oils being created?

Research, development and testing

PC-11: Descripción del próximo cambio de especificación APIThe two new diesel engine oils are going through research and development, ensuring the lubricant technology will meet new performance targets while improving engine wear protection. Then, the oils will be introduced after being proven via extensive field testing.

As of March 2016, we have accumulated more than 44 million kilometers of testing data on our CK-4 and FA-4 formulations. We are also now accumulating more than 2.4 million kilometers a month of additional testing data with select fleet partners. Our current field testing includes about 200 trucks.