Approximately how much fluid is not replaced during a typical fluid and filter change on an automatic transmission?

Approximately how much fluid is not replaced during a typical fluid and filter change on an automatic transmission?

• A. 1 to 2 quarts (0.9 to 1.9 liters)
• B. 3 to 4 quarts (2.8 to 3.8 liters)
• C. 10 to 15 quarts (9.5 to 14.2 liters)
• D. 5 to 8 quarts (4.7 to 5.7 liters)

Answer: (D)

When you do a typical automatic transmission fluid and filter change, you can drain the pan and replace the fluid, but a portion of the fluid remains inside the transmission where the pan drain can’t reach. Fluid stays in the torque converter, cooler lines, and internal passages, so you don’t remove every drop. Because many transmissions hold roughly 9 to 15 quarts in total, a standard pan drain and filter change ends up replacing only part of that capacity, leaving about five to eight quarts still in the system. That’s why the amount not replaced is around five to eight quarts. Smaller amounts would understate what’s left due to those components that can’t be drained, while much larger amounts would overstate the fluid remaining after a typical service.

When you do a typical automatic transmission fluid and filter change, you can drain the pan and replace the fluid, but a portion of the fluid remains inside the transmission where the pan drain can’t reach. Fluid stays in the torque converter, cooler lines, and internal passages, so you don’t remove every drop. Because many transmissions hold roughly 9 to 15 quarts in total, a standard pan drain and filter change ends up replacing only part of that capacity, leaving about five to eight quarts still in the system. That’s why the amount not replaced is around five to eight quarts. Smaller amounts would understate what’s left due to those components that can’t be drained, while much larger amounts would overstate the fluid remaining after a typical service.