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While it’s no secret that heavy-duty formulations are changing to incorporate the new API CK-4 and FA-4 categories, here at Kendall we made a commitment to make sure we went the extra mile. Well, actually, we went the extra 67 million miles in the lab and on the road, because that’s how many miles worth of engine testing we ran on our brand new formulations. The results are certainly worth taking a look at before December when the new API CK-4 and FA-4 formulations hit the market.

Every single test conducted using Kendall Motor Oil’s CK-4 and FA-4 formulations proved to vastly exceed API’s performance requirements. Not only that, but post-testing performance analyses showed that engines using Kendall Motor Oil’s updated formulations held far better resistance levels against wear, corrosion, and sludge formation, than engines using our already strong CJ-4 formula.

The Proof Is In The Parts

When it comes to Kendall, seeing is believing. Take a look at those engine parts below. After 540,000 miles of on-road testing, these parts still look and function like they’re fresh out of the factory. Select a part to see how it performed in industry standard bench testing.


Kendall protects the engine parts that allow for efficient power generation.


Kendall keeps sludge from robbing your engine of power and longevity.

Valve Train

Kendall helps valves maintain their precision in regulating intake, combustion, and exhaust.


Kendall provides engine cleanliness and oxidation stability for maximum performance from your turbo.

Kendall Performance for API CK-4 and FA-4