What is the applicable range of gear oil 85w140?
2 Answers
Gear oil 85w140 is suitable for vehicles operating in regions where temperatures range between -16°C and 50°C throughout the year, such as Jiangnan areas and regions where winter temperatures do not drop below -10°C. The applicable range of gear oil is determined by the vehicle's operating environment. In gear oil 85w140, the 'W' stands for winter-type gear oil, '85' represents the low-temperature viscosity. The smaller the number, the lower the viscosity, resulting in better low-temperature fluidity and stronger low-temperature performance. '140' indicates the high-temperature viscosity, where a larger number means higher high-temperature viscosity and greater resistance to higher temperatures. Gear oils can be classified into single-grade viscosity types and multi-grade all-weather types, with single-grade viscosity types further divided into high-temperature and low-temperature types. The functions of automotive gear oil include: lubricating the transmission system to reduce wear on gears and other moving parts, ensuring normal operation of the transmission system, and extending its service life. It also cools transmission components, as friction between gear surfaces generates significant heat. If not dissipated promptly, this can lead to localized high temperatures on the gear surfaces, potentially causing burning and adhesion. The gear oil continuously carries away heat during circulation lubrication, dissipating it through the air and the transmission housing to ensure proper functioning of the transmission components.
I drive a ten-year-old SUV myself and frequently take long-distance mountain trips, so I have a deep appreciation for gear oil 85w140. This type of oil is best suited for heavy loads and high-stress scenarios, such as when my vehicle is climbing steep slopes or towing an RV, where the differential and rear axle endure significant pressure. The thick viscosity of 85w140 provides superior lubrication, preventing overheating and wear. It is also commonly used in commercial vehicles, like large trucks or transport fleets, as these vehicles often operate under full load and require protection for their gear systems under high temperatures. I must remind everyone not to use it in regular passenger cars, as it can easily increase fuel consumption. Regularly checking the oil level is crucial—I typically change it every 30,000 kilometers to ensure the gear system runs smoothly, as excessive wear can lead to costly repairs. If you love road trips like I do and frequently tackle rough terrain, choosing the right oil grade during oil changes can help avoid breakdowns midway.
