Last December, for the first time, the American Petroleum Institute started licensing two different approved heavy-duty diesel engine oils. CK-4 adoption is going largely as expected, but very few fleets are using FA-4 yet – because very few engine makers so far are recommending it.
The organization has licensed about 400 CK-4 oils and more than 60 FA-4 oils submitted by marketers, making the robust new classifications available to operators of new and older diesels.
Re-refined motor oil is better for the environment, domestically produced and its cost is comparable to traditional motor oil. But is it safe for your engine?
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