What kind of oil should be used in a continuously variable transmission?
3 Answers
Continuously variable transmissions require gear oil, and it is recommended to use gear oil with a viscosity below 150, preferably on the lower side. The specific choice depends on the model of the machine and the working environment. Introduction to Continuously Variable Transmission: A continuously variable transmission (CVT) is a type of automatic transmission in vehicles that can continuously obtain any transmission ratio within its range. It allows for optimal matching between the transmission system and the engine's operating conditions. Common types of CVTs include hydro-mechanical continuously variable transmissions, metal belt-type continuously variable transmissions (VDT-CVT), and variable-angle continuously variable transmissions. Difference between CVT and Automatic Transmission: The main difference between a CVT and a conventional automatic transmission is that the CVT eliminates the complex and bulky gear combination for transmission, instead using only two sets of pulleys for variable transmission. By changing the contact radius of the drive belt between the driving and driven pulleys, the CVT achieves variable transmission, showcasing a very ingenious design concept.
A continuously variable transmission (CVT) typically refers to a CVT gearbox, which requires the use of specialized CVT transmission fluid. I have driven such a vehicle for many years, and based on my experience, using regular automatic transmission fluid as a substitute may cause slippage or wear. This is because the internal structure of a CVT relies on belt or chain slippage to function, and the fluid must have specific friction properties and low viscosity. Different vehicle models have different requirements, such as Honda's CVTF or Toyota's WS-specification fluid. Therefore, when replacing the fluid, it is essential to check the owner's manual or consult a 4S dealership. Regular maintenance is also crucial, and it is recommended to change the fluid every 40,000 to 60,000 kilometers to prevent fluid degradation from affecting performance. I have seen many people neglect this, resulting in damaged transmissions and higher repair costs. The key to extending component lifespan lies in selecting the correct fluid and performing timely maintenance.
CVT transmission fluid must be specialized. As someone who enjoys tinkering with automotive knowledge, I've found that regular AT fluid has higher viscosity and isn't suitable for CVT's pulley system. It requires low-resistance and high-stability fluid to reduce thermal damage. Recommended brands include Idemitsu's CVT-specific fluid or OEM-specified models. Replacement intervals are typically around 50,000 kilometers as per the manual, and maintaining proper lubrication can improve transmission efficiency. Don't forget to check the fluid level when the engine is warm – this simple procedure can prevent oil starvation issues.
