FA-4 is a lower-viscosity synthetic blend specifically designed for newer engines with advanced aftertreatment systems, such as Diesel Particulate Filters (DPFs) and Selective Catalytic Reduction (SCR) units. Using an older CK-4 oil in a model year 2010 or newer truck can actually damage the emissions equipment, making the API rating just as crucial as the viscosity number when searching for the best oil for 6.
Understanding 6.7 Cummins Oil Viscosity for Optimal Engine Protection
Choosing a lubricant that fails to meet these rigorous demands can lead to increased wear, reduced fuel economy, and potentially catastrophic engine failure over time. Additive Technology and Detergency The best oil for 6.
The oil in this system must maintain a stable viscosity, known as the oil grade, to ensure a proper film strength regardless of whether the engine is cold on a winter morning or running hot under a heavy load. Conventional: Performance and Longevity While budget constraints often lead vehicle owners to conventional mineral oil, the consensus among mechanics and enthusiasts alike is that synthetic formulations provide the necessary protection for a turbocharged diesel engine.
6.7 Cummins Best Oil Viscosity Guide: Matching FA-4 and CK-4 to Your Engine
This engine, found in heavy-duty trucks and vans, operates under immense pressure and temperature, meaning the oil circulating through its galleries is responsible for carrying away heat, suspending contaminants, and preventing metal-on-metal contact. Diesel engines produce soot and acidic byproducts that accumulate in the oil.
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