Diesel Engine Oils for API CF-4/CH-4/CI-4 Grades API CF-4, CH-4, and CI-4 are all specifications for diesel engine oils. These specifications indicate the performance level and quality of the oil, with each subsequent specification providing improved performance and protection for newer engine designs. Here are some diesel engine oils that meet the API CF-4, CH-4, and CI-4 grades: 1. Shell Rotella T4 Triple Protection: This Lubricants Oil meets the API CK-4, CJ-4, CI-4 Plus, CI-4, CH-4, CF-4, and CF specifications. It provides excellent protection against wear, deposits, and oil breakdown. 2. Mobil Delvac 1300 Super: This oil meets the API CK-4, CJ-4, CI-4 Plus, CI-4, CH-4, CF-4, and CF specifications. It offers outstanding protection against wear, deposits, and oil breakdown, while also providing good fuel economy. 3. Castrol GTX Diesel: This oil meets the API CI-4, CH-4, CG-4, and CF-4 specifications. It provides excellent protection against wear, deposits, and oil brea…