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Core Information
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CK-4 + FA-4: Parts Rating
API CK-4 vs FA-4: Diesel Oil Compatibility Guide
CK-4/FA-4 Heavy Duty Engine Oil: The Future of Fuel Economy
How big are the engine oil fuel economy benefits
What Shop Owners and Mechanics Need to Know About CK-4 and FA-4
The tale of the inefficient engine oil
Lubrizol talks new engine oil categories (CK-4, FA-4)
How to Spot CK-4 and FA-4 Diesel Oil
Shell Rotella - CK4 & FA4 Oils Explainer
In The Workshop #31 - The API CK-4 and FA-4 Diesel Oil Specs
Let’s talk FA-4 engine oil benefits and management
Deep Dive
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Last Updated: August 22, 2026
Conclusion
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