Carbo Oil diesel engine oils meet API CI-4 and CH-4 ratings for trucks, buses, and heavy commercial vehicles. High TBN formula neutralises sulphur acids in BS6 ULSD fuel. Compatible with Tata, Ashok Leyland, Mahindra, Eicher, and VECV commercial fleets. Available in 15W-40 and 20W-50 grades for Indian climate conditions.
API CI-4 rated 15W-40 diesel oil is standard for Indian commercial vehicles including Tata, Ashok Leyland, Eicher, and Mahindra trucks. For high-temperature long-haul applications, 20W-50 may be recommended by the OEM.
API CI-4 is the rating for turbocharged diesel engines with EGR (Exhaust Gas Recirculation). It provides better soot dispersal and thermal stability than older CH-4. Most BS6 commercial vehicles require at least CI-4 rated diesel oil.
Every 15,000–20,000 km for long-haul trucks (without oil analysis), or 25,000–40,000 km with an oil analysis programme. City-operation trucks should change every 10,000–15,000 km due to higher stop-start thermal cycling.
