LUBRICANT SPECIFICATIONS Recommended Lubricants 5 (03/17) Y53-6077-1B1 5-49 Type Grade (SAE) Ambient Temperature Heavy Duty Engine Oil MIL-L-2104B, C, or D; API - SF, or API-CD 50 Above 10° F (-12° C) 40 Above 10° F (-12° C) 30 Below 10° F (-12° C) Mineral gear oil with rust and oxidation inhibitor API-GL-1 90 Above 10° F (-12° C) 80W Below 10° F (-12° C) Synthetic Lubricant* 50 All *See your dealer for approved brands.