How often should truck gear oil and rear axle oil be changed?

[JosephRose]

Generally, the gear oil for trucks should be changed every 60,000 kilometers to effectively improve the efficiency of gear transmission of engine power. There is no specific regulation for the replacement cycle of rear axle oil, which should be determined based on the driving conditions and environment of the vehicle. Additionally, different oil brands may have varying intervals, but typically it should be changed every 20,000-30,000 kilometers. Below is the relevant introduction: 1. Gear oil: Mainly refers to the lubricating oil for the transmission and rear axle. It differs from engine oil in terms of usage conditions, composition, and performance characteristics. Gear oil primarily serves to lubricate gears and bearings, prevent wear and rust, and assist in heat dissipation for the gears. 2. Rear axle oil: During maintenance, it should be removed, cleaned, and unclogged to ensure smooth airflow in the passages, which can prevent increased pressure inside the axle housing due to blocked passages and subsequent oil leakage at the mating surfaces and seals.