What oil is used for a four-wheel drive transfer case?

[VanKeira]

Four-wheel drive transfer cases use gear oil, which is primarily based on petroleum lubricating oil or synthetic lubricating oil. Benefits of using gear oil in four-wheel drive transfer cases: Reduces friction and wear, controls clutch friction and synchronizer performance, handles loads (low-speed high torque, vibration loads), dissipates heat, reduces vibration and noise, cleans contaminants from gear meshing areas—providing a cleaning function—and prevents corrosion, among others. Classification of four-wheel drive systems: Part-time four-wheel drive is a system where the driver can manually switch between two-wheel drive and four-wheel drive. On-demand four-wheel drive is a system that engages four-wheel drive only when necessary, typically operating in two-wheel drive under normal conditions. Full-time four-wheel drive ensures all wheels are independently driven at all times while the vehicle is in motion.