Genuine John Deere EP511 Plus-50 II Engine Oil is an exclusive formulation designed to provide advanced protection for John Deere diesel engines. This high-performance oil exceeds API CJ-4 performance levels and is backward compatible with all diesel engines requiring API CI-4, CH-4, CG-4, and CF-4. Featuring extended drain intervals and a low ash formulation, it helps to maximize engine life and maintain performance in demanding agricultural and construction applications. Plus-50 II is available in 15W-40 and 10W-30 viscosity grades.