What are the effects of not changing the transmission oil for 100,000 kilometers in a manual transmission?

[DiIsaac]

Some transmission oils may undergo changes in pH levels, leading to corrosion of transmission gears and thickening of the oil. Below are the relevant details: Transmission Oil: Transmission oil not only lubricates and protects the transmission but also facilitates power transmission, gear cooling, cleaning, and rust prevention. Compared to engine oil, transmission oil has better fluidity and is less viscous. Manual Transmission: Manual transmissions are commonly found in many Japanese cars, which mostly use CVT transmissions. For Honda CVT transmissions, it is recommended to change the oil every 3 years or approximately 40,000-60,000 kilometers. For Toyota CVT transmissions, the recommendation is every 3-4 years or around 50,000-60,000 kilometers.