Even with potential fuel economy gains, fleets have been slow to adopt the new FA-4 engine oils. Experts from ATA's Technology & Maintenance Council explore some of the reasons why fleets seem to be waiting.
New API Diesel Engine Oil Categories Arrive Dec. 1
The American Petroleum Institute's new diesel engine oil-service categories, API CK-4 and FA-4, will begin appearing in the marketplace on Dec. 1.
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