RIDGELINE™ SAE 0W-40 CK-4 is a high
performance, full synthetic heavy duty engine
oil formulated for modern diesel powered
engines operating across a range of severe
applications. This oil offers excellent shear
stability and is reliable for extreme cold
engine start-up. Advanced API CK-4 additive
technology is fully backwards compatible
with, and replaces, service categories CJ-4,
CI-4 Plus, and previous.