CI-4 against CJ-4: Is One Diesel Oil Spec Better than the Other?
It is a regular occurrence to hear customers talking about the relative positives & negatives of the newer CJ-4 diesel oils vs. the older CI-4 diesel engine oils. As a result, it seems that it would be helpful for us to discuss a few issues regarding the differences between these two API classifications. Many of our customers are seeking our AMSOIL 15w40 diesel oil. Most often, this is either because they fear switching over to a “lighter” viscosity 5w30, 10w30, 5w40 or 10w40 oil or beca
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