How Many Liters of Transmission Fluid Are Needed for a Highlander Transmission Fluid Change?
3 Answers
When changing the transmission fluid in a Highlander, manual fluid change (gravity drain) requires four to six liters; using a fluid exchange machine requires approximately nine to twelve liters. Functions of transmission fluid: Reduces friction and wear, controls clutch friction and synchronizer performance; carries loads (low-speed high torque, vibration loads), dissipates heat, reduces vibration and noise, removes contaminants from gear meshing (cleaning function); prevents corrosion, pitting, and surface metal tearing, isolates metal surfaces to prevent direct metal-to-metal contact. Hazards of not changing transmission fluid for a long time: Causes damage to the transmission's shift control mechanism; leads to abnormal wear of gears and clutch plates inside the transmission; affects the normal operation of the transmission, resulting in damage to the transmission valve body. Methods for changing transmission fluid are as follows: Loosen the drain plug at the bottom of the transmission to drain the fluid before refilling. Remove the transmission oil pan directly for draining and refilling: this method is more thorough than the previous one, removing impurities from the bottom of the oil pan. Using a circulation machine to change automatic transmission fluid: dynamic fluid exchange with an intelligent circulation machine can filter and clean sludge and impurities inside the automatic transmission.
I remember when changing the transmission fluid for the Highlander, it usually requires around 4 to 5 liters. The exact amount depends on the model year—for example, the 2015 model needs about 4 liters for a gravity drain, while the 2020 model may require close to 5 liters. Regular replacement every 60,000 kilometers can prevent gear-shifting hesitation or overheating issues. I recommend going to a professional shop to ensure the job is done right, keeping the car running smoothly and worry-free. Don’t underestimate this small maintenance step—it’s a core procedure to protect the transmission, extend the vehicle’s lifespan, and save money and hassle in the long run.
As a long-term Highlander user, I've changed the transmission fluid several times, using about 4 liters a bit more each time. The key is to choose genuine OEM fluid, don't cheap out with off-brand products. The replacement process isn't complicated - the dealership can handle it in about half an hour, and the fluid cost isn't expensive either. Regular maintenance like this keeps the driving feel smooth and gives peace of mind with no strange noises at highway speeds.
