Full explanation
Designation XW-Y: X is the winter class (cold flow): 0W=−40°C, 5W=−35°C, 10W=−30°C, 15W=−25°C, 20W=−20°C. Y is the summer class (viscosity at 100°C): 30, 40, 50. 15W-40 is the Ukrainian default (−25°C to +40°C); 5W-30 low-SAPS is for Stage V. KEY SPECS FOR MODERN TRACTORS: (1) API CK-4 / CJ-4 — low SAPS for DPF; (2) ACEA E9 — European equivalent; (3) MB 228.51 / MAN 3477; (4) Caterpillar ECF-3; (5) Volvo VDS-4.5. Using standard 15W-40 API CI-4 in a Stage V engine clogs the DPF in 500–800 engine hours due to high sulphated ash. Price April 2026: Shell Rimula R5 LE 15W-40 API CK-4 — UAH 200–280/L, Mobil Delvac MX ESP 15W-40 — UAH 220–310/L, budget Oscar, Ukrlubes — UAH 110–160/L (lower quality). Change interval: 400–500 engine hours (diesel with DPF), 300–400 for standard diesel.