What Does 15W40 CK4 Engine Oil Mean? How Is It Different from 5W40 CK4 Oil?

One of the American Petroleum Institute's (API) numerous tasks is to set engine oil standards. As engine technology evolves, the API incorporates those advancements as well as the most recent regulatory restrictions. They generate new criteria on a regular basis. The API issued new service categories after approving CJ4 as the standard lubricant for diesel engines for over a decade.

Since that time, fleets and shops have had a number of years to transition to the new lubricants. Those with older trucks, on the other hand, may not have made the move yet. If you've been wondering what the difference between CJ4 and synthetic CK4 engine oil is, here's the lowdown:

Is the Chemistry of Synthetic CK4 Engine Oil Superior Than That of CJ4?

It's a good question, and one that hasn't been answered in depth by experts or lubricant producers. If you're wondering about the chemistry, comparing labels on various heavy-duty engine oils is the closest you'll come to an answer.

Synthetic CK4 engine oils have larger total base numbers than other oils (TBNs). Calcium, zinc, boron, and phosphorus levels are also elevated. They're also less common in SAPS. Lower additive concentration isn't a big deal, though, because the levels in CJ4 oils are already rather low.

Comparing CK4 vs CJ4

You don't need to be an expert in chemistry to see why CK4 is preferable to CJ4. The oxidative stability, aeration resistance, and shear stability of the new oils have all increased. In reality, lubricants must pass two additional tests viz the Mack T13 test and the CAT Aeration test to meet the CK4 oil API criteria.

Furthermore, synthetic CK4 engine oiloffers superior engine protection than CJ4 oils. Because of the lower viscosity classes, using CK4 should extend the duration between oil changes and improve fuel efficiency. You'll see recognisable, frequent grades like:

  • 5W-30
  • 5W-40
  • 10W-30
  • 15W-40

All Diesel Oil Brands Aren’t the Same

The API creates a standard, but that does not imply that all oil brands are created equal. Some may see the requirement as a bare minimum that must be reached. Others will see it as a place to start when developing a better offering or product.

When it comes to choosing which brand to utilise in your business's equipment, it makes sense to choose brands that meet industry requirements. If you already have a trusted brand, there's no reason not to stick with it. When comparing CK4 and CJ4 and deciding which to use, it's a good idea to think about other oils with high reputations that you haven't tried before.

Learn to read labels if you're going to shop for brands. Check to discover if the brand has done its own testing in addition to the API-required trials.Word of mouth is also quite significant. Inquire with heavy-duty technicians about the products they use and why they suggest them.

Consequences of Not Using Synthetic CK4 Engine Oil

With the advantages of CK4 over CJ4, it's clear why you should utilise it. It isn't required or even recommended for older vehicles. Changing to synthetic CK4 engine oilis a no-brainer if it improves your semi's fuel efficiency, general performance, and longevity.

But what about the other way around?

CJ4 oil isn't entirely forward compatible because it was created in the past to preserve outdated technologies. Although it is unlikely to improve Tier 4 performance, it will not harm a modern engine.

Even yet, using an older formula oil in a modern engine, such as CH4 or CI4, might have detrimental consequences. These oils have the potential to:

  • Pollute the after-treatment system's catalytic matter, preventing it from performing correctly.
  • Plugging the diesel particulate filter will shorten the engine's life.
  • Performance and efficiency are harmed.

Go for 15W40 Heavy-Duty Diesel Engine Oil from DOXA

DOXA's totally synthetic and heavy-duty diesel engine oils have been formulated to surpass traditional diesel engine lubricants on the market today.

Their 15W40 heavy-duty diesel engine oil is formulated to fulfill the most stringent performance criteria of today's high-output, low-emission European and American diesel engines. To provide the highest diesel engine performance, it's created with a high-quality base oil and cutting-edge additive technology.

All of their heavy-duty engine oils (5W40, 15W-40 and 10W-30) meet or exceed the requirements of CK-4, CJ-4, CI-4 PLUS, and previous classifications.

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