Diesel Oils
CI-4 vs CH-4: Which Diesel Engine Oil Do You Need?
Diesel engine oils come in different API classifications. Understanding the difference between CI-4 and CH-4 can save your engine from premature wear.
Choosing the right diesel engine oil is critical for commercial vehicles and heavy equipment. The two most common API classifications you'll encounter are CH-4 and CI-4.
API CH-4
Introduced in 1998, CH-4 was designed for high-speed, four-stroke diesel engines. It provides excellent protection against: - High-temperature deposits - Wear and corrosion - Soot-related viscosity increase
CH-4 oils are suitable for older diesel engines and those without exhaust gas recirculation (EGR) systems.
API CI-4
Introduced in 2002, CI-4 was developed specifically for engines equipped with EGR systems, which were introduced to reduce emissions. CI-4 provides: - Better soot dispersancy - Improved oxidation stability - Enhanced protection against viscosity loss
Which Should You Use?
For modern commercial vehicles with EGR systems, CI-4 is the minimum requirement. MB Lubricants' HI-LUBE TRUCK LONGRUN CI-4 is formulated specifically for these demanding applications, providing extended drain intervals and superior protection.
For older equipment without EGR, HI-LUBE TRUCK CH-4 delivers reliable protection at a practical cost.