
The new Alto has different models. For automatic transmissions, use automatic transmission fluid (ATF), and for manual transmissions, use gear oil. Hazards of not changing transmission oil: 1. Damage to the transmission's shift control mechanism; 2. Abnormal wear of gears and clutch plates inside the transmission; 3. Affects the normal operation of the transmission, leading to damage to the transmission valve body. Transmission oil is different from engine oil. Although both oils serve a lubricating function, their specific roles differ and should not be confused. Differences: Engine oil is a lubricant for the engine system, possessing properties such as oxidation resistance, anti-wear, and anti-corrosion. Transmission oil, on the other hand, is primarily used to keep the shift system clean and extend the service life of internal transmission components. Due to the different structures and operating environments of the transmission and engine, transmission oil cannot be used as engine oil, nor can engine oil be used as transmission oil.

The manual transmission oil for the new Alto typically uses GL-4 75W-90 gear oil, while the automatic transmission requires ATF automatic transmission fluid. My Alto has had two oil changes in five years, each time using the factory-recommended 75W-90. Remember not to casually substitute GL-5 for GL-4—even though it’s a higher grade, it can corrode synchronizers. The oil change requires about 2.2 liters, and if you’re handy, you can do it yourself—just unscrew the drain plug under the chassis. It’s recommended to inspect it every 40,000 kilometers; if shifting feels rough, it’s time for a change. The factory manual is the most reliable, as specifications may vary slightly between model years.

Having driven seven or eight small cars, the transmission oil for Alto is actually quite easy to choose. For manual transmissions, GL-4 grade 75W-90 viscosity is recommended, as this type is suitable for all seasons and fuel-efficient. Major brands like Shell and Mobil have produced dedicated versions, with a 4L bucket being enough for two changes. Automatic transmissions must use ATF oil, such as DEXRON VI. When changing the oil, make sure not to mix old and new oil; drain the old completely before adding the new. In hot southern summers, 80W-90 can be chosen, though the gear shifting feel in winter might be slightly stiffer compared to 75W. If the transmission oil turns black or smells foul, it's a sign of aging.

Common mistakes when car owners use the wrong oil during repairs. The Alto manual transmission requires GL-4 specification because GL-5 has high sulfur content which can damage brass components. The 75W-90 model balances low-temperature fluidity and high-temperature protection, making it suitable for northern cars to start smoothly in winter. For automatic transmissions, it's important to check whether it's CVT or AT, as most use automatic transmission fluid (ATF). The oil change interval is stated as 50,000 kilometers in the manual, but it's better to advance it to 40,000 kilometers under congested urban driving conditions. The oil pan has a magnetic drain plug; excessive metal shavings indicate gear wear.


