API CF-4 15W-40 is a heavy-duty diesel engine oil specification introduced by the American Petroleum Institute (API) in 1994. Although now considered an obsolete category by the API, it is manufactured and used globally for older diesel engines, typically those from the early 1990s.
Common Uses and Application
Heavy Duty Diesel Vehicles: Used in commercial diesel trucks, transport vehicles, and buses.
Off-Highway Equipment: Ideal for construction, mining, and agricultural machinery.
Mixed Fleet Applications: Many older fleets use 15W40 CF-4 as recommended for marine diesel engines in fishing, dredging, and inland service.
Mixed Fleet: Suitable for mixed fleets containing older diesel engines that require API CF-4, often with dual rating for gasoline engines.
PRODUCT PERFORMANCE
API CF-4 15W40 is a widely used heavy-duty diesel engine oil designed for high-speed, four-stroke engines, including turbocharged models. It has been proven robust protection in older or high-mileage engines and is generally considered a cost-effective choice for commercial, agricultural, and mixed-fleet applications.
