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Get Ready for the Future of Engine Oil: Understanding PC-12

What exactly is PC-12, and why should fleets start paying attention now?

The trucking industry is at a pivotal point when it comes to engine oil technology. As emissions regulations tighten and engine hardware evolves, the need for more advanced lubricants becomes increasingly important. That’s where PC-12 engine oil comes in—the next generation standard set to replace API CK-4 and API FA-4 starting in 2027.

But what exactly is PC-12, and why should fleets start paying attention now?

Under The Hood - PC-12 | Shell Rotella

Read the transcript

Title:{ Under The Hood - PC-12 | Shell Rotella}

Duration: {3 minutes and 50 seconds}

Description:

{The heavy duty engine oil industry is preparing for a major change in 2027 as new regulations on engine emissions take effect, requiring updated oil performance standards. To support truckers through this transition, Shell has developed a dedicated website to provide education, leadership, and ongoing updates. The new Proposed Category 12 (PC-12) engine oil category, endorsed by API in 2022, will replace the current CK-4 and FA-4 categories. While no changes will occur immediately for Shell Rotella products, Shell is actively preparing to launch PC-12 oils in 2027, ensuring compatibility and reliability for truckers now and into the future.}

{ Under The Hood - PC-12 } Transcript

Transcript:

{Julie Wright, Shell Rotella Brand Manager}

Thanks for joining me today, Karin.

{Karin Haumann, OEM Technical Manager for Shell Rotella}

Good to see you, Julie.

{Julie Wright, Shell Rotella Brand Manager}

So I wanted to talk about the Proposed Category 12, or PC-12, engine oil category that was endorsed by the API in 2022. This will be the new engine oil category that will be rolled out in 2027 and replace the current CK-4 and FA-4 categories that are in the market today.

{Karin Haumann, OEM Technical Manager for Shell Rotella}

That's right.

{Julie Wright, Shell Rotella Brand Manager}

So as the Chairperson of the API's New Category Development Team, can you tell me a little bit about what that team does?

{Karin Haumann, OEM Technical Manager for Shell Rotella}

NCDT is a subcommittee that was convened specifically for the purpose of developing the new diesel engine oil service category. So we are working together with all interest parties in the industry to be able to identify performance requirements, develop tests, and launch the new category.

{Julie Wright, Shell Rotella Brand Manager}

Before we go any further, can you explain to me why there's a need for a new engine oil category?

{Karin Haumann, OEM Technical Manager for Shell Rotella}

Sure, you mentioned 2022. That's when the EPA introduced their new proposed rule that takes effect in 2027, so that's really what's driving our timeline.The engine manufacturers have new Nox and emission targets that they have to meet, and they're working hard over these five years to be able to improve their hardware and improve their performance. With that comes a need for us to be able to increase the performance of the oil so that they can work hand in hand and that we help them to meet those targets.

{Julie Wright, Shell Rotella Brand Manager}

So I've been getting a lot of questions about backwards compatibility, and I know that this new engine oil spec is being developed for new engines. But what about those older engines that are on the road today? Can you talk a little bit about that?

{Karin Haumann, OEM Technical Manager for Shell Rotella}

That's a good question. It's at the top of a lot of people's minds. There's a lot of focus on 2027 and the new engines and the new oil and where does that leave everybody else. Well, we are working very hard to make sure that we are developing a new category for all of the engines on the road. This is intended to replace CK-4, and so we're working to develop a category that meets the needs of the new engines along with all of the engines that are on the roads today.

{Julie Wright, Shell Rotella Brand Manager}

Great news. So you talked about 2022 regulations, that's when these were passed, but the new engine oil category is not gonna be rolled out until 2027. So what happens in the meantime there?

{Karin Haumann, OEM Technical Manager for Shell Rotella}

The EPA rule was proposed in 2022, takes effect in 2027, and that's to give everybody enough time to be able to prepare. So that's what we're doing now. It's a long process for developing a new category. It's a very well-prescribed process by API, so we're working through those steps right now. We're working on making sure that we define all of the performance requirements, and we're getting ready to launch into the exciting phase, where we're gonna be testing the new candidate oils and make sure that we have the same performance and protection that you've come to expect.

{Julie Wright, Shell Rotella Brand Manager}

How does this impact Shell Rotella currently and then in the future?

{Karin Haumann, OEM Technical Manager for Shell Rotella}

You won't see changes currently. So we're not changing our Rotella products today, but we are working hard to meet the 2027 launch for the first licensing for the new oils. So you can start to see those oils come into the market in 2027.

{Julie Wright, Shell Rotella Brand Manager}

Lots of PC-12 developments and news and can't wait to hear more.

{Karin Haumann, OEM Technical Manager for Shell Rotella}

Yeah, more to come, we'll keep you posted.

{Julie Wright, Shell Rotella Brand Manager}

All right, great, thank you for meeting with me.

{Karin Haumann, OEM Technical Manager for Shell Rotella}

You're welcome.

The trucking industry is at a pivotal point when it comes to engine oil technology. As emissions regulations tighten and engine hardware evolves, the need for more advanced lubricants becomes increasingly important. That’s where PC-12 engine oil comes in—the next generation standard set to replace API CK-4 and API FA-4 starting in 2027.

But what exactly is PC-12, and why should fleets start paying attention now?

Check out this PC-12 video: Under The Hood - PC-12 | Shell Rotella

What is PC-12?

PC-12 is the upcoming oil category being developed by the American Petroleum Institute (API) in collaboration with engine and vehicle manufacturers, oil marketers, additive suppliers and other interested parties. It is being created in response to:

  • Upcoming EPA 2027 emission regulations
  • Changes in engine design, such as increased use of EGR (Exhaust Gas Recirculation) and lower CO₂ targets
  • OEM demands for enhanced durability, wear protection, and fuel efficiency

There will be two subcategories within PC-12:

  • PC-12A: Backward compatible with most current engines
  • PC-12B: Designed for next-gen engines and offering fuel economy benefits, but not backward compatible

Why It Matters to Fleets

The move to PC-12 isn’t just about compliance; it’s about performance, longevity, and cost savings. Fleets that plan ahead will be best positioned to:

  • Maximize engine protection: PC-12 oils will have enhanced oxidation stability and shear resistance, making them ideal for longer drain intervals and demanding duty cycles.
  • Improve fuel economy: With lower viscosity grades and better thermal performance, PC-12 is expected to contribute to reduced fuel consumption—an essential advantage for fleets facing tight margins.
  • Extend equipment life: Advanced detergents and dispersants in PC-12 oils help minimize deposits, reducing wear and improving engine cleanliness.
  • Meet OEM requirements: Many manufacturers are already designing engines with PC-12 compatibility in mind, and using the right oil will be key for warranty compliance and optimal performance.

When to Prepare

The API is targeting the first licensing of PC-12 engine oils on January 1, 2027, in line with the implementation of the 2027 EPA regulations. Proactive fleet managers should start the conversation with their lubricant suppliers now. Understanding how your fleet's equipment, routes, and maintenance schedules may be affected can ensure a smooth transition.

Karin Haumann, OEM Technical Services Manager with Shell Global Solutions, is the chairperson of the API New Category Development Team for PC-12. Shell Lubricants is developing and conducting field trials of Shell Rotella candidate oils to meet PC-12 specifications. Fleets can expect the same trusted protection from Rotella with enhanced benefits tailored for future engine technologies.