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FA-4

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.

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Truck Engine Teardown Examines FA-4 Oil Protection [video]

New fuel-efficient API FA-4 oils have lower viscosity, leading some to worry about engine protection. Chevron recently completed a 500,000-mile engine teardown at a Georgia trucking fleet that's been testing these oil formulations for four years.