How Many Liters of Transmission Fluid Should Be Added to a Car?
2 Answers
Automatic transmissions generally have two methods for changing the fluid: one is gravity draining, and the other is using a flushing machine. Gravity draining requires 3~4L of fluid, while the flushing machine requires 12L. Related details are as follows: 1. Using a flushing machine to change the transmission fluid is done while the car is running, allowing the fluid to circulate inside and carry out contaminants from the transmission. This method typically requires 12 liters of transmission fluid and is more thorough and clean. 2. Transmission fluid is primarily composed of petroleum-based lubricating oil or synthetic lubricating oil, mixed with extreme pressure anti-wear agents and oiliness agents to form an important lubricant. It is used in various gear transmission devices to prevent gear surface wear, scuffing, sintering, etc., thereby extending their service life and improving power transmission efficiency.
I've repaired so many cars, and the transmission fluid capacity is definitely not fixed. Manual transmissions usually take 4 to 6 liters, but automatics, especially those in luxury cars, can gulp down over 8 liters. Just the other day, I serviced an old Crown with a 3.0L engine—it took a full 7.2 liters to meet the standard. The key factors are the shape of the oil pan and the torque converter capacity. You can't get an accurate reading if the fluid temperature isn’t at least 80°C. Pouring fluid recklessly through the filler port is a bad idea—it’ll either overfill, causing harsh shifts, or spill out, making the engine bay a sticky mess. Your best bet is to check the owner’s manual; the listed capacity is the safest reference.
