2016 Subaru Outback Transmission Fluid & Service

Quick answer

• Transmission Make/Model: Lineartronic TR580 CVT
• OEM Fluid Spec: Subaru CVTF-II
• Drain & Fill Capacity: Approximately 6.0 US Quarts (5.7 Liters)
• Full Overhaul Capacity: Approximately 13.1 US Quarts (12.4 Liters)
• Filter OEM Part Number: Internal filter is generally not serviceable. External cooler filter (if equipped, verify on vehicle) PN: 31728AA122 (often called a 'CVT filter' or 'strainer')
• Recommended Service Interval: Every 60,000 miles for normal driving; every 30,000 miles for severe duty/towing.

Fluid type explained

The 2016 Subaru Outback, when equipped with the 2.5L or 3.6L engine, utilizes Subaru's Lineartronic TR580 Continuously Variable Transmission (CVT). This transmission requires a very specific fluid designed for CVTs, known as Subaru CVTF-II. It is crucial to use only genuine Subaru CVTF-II fluid or an approved equivalent that explicitly states compliance with the Subaru CVTF-II specification. Using conventional automatic transmission fluid (ATF) or a non-compliant CVT fluid can lead to severe transmission damage, premature wear of the belt and pulleys, and costly repairs.

CVT fluid is engineered with unique friction modifiers and viscosity characteristics to ensure the proper operation of the steel belt or chain and pulley system within the transmission. These components rely on precise friction to transmit power efficiently. Incorrect fluid can cause slipping, shuddering, overheating, and ultimately, transmission failure.

Service procedure

Servicing the TR580 CVT typically involves a drain and fill procedure. A full fluid exchange using specialized equipment is also possible but often not recommended by Subaru unless specific conditions warrant it, due to the complexity and potential for air introduction.

Drain & Fill Procedure (DIY capable, but professional service recommended):

1. Warm-Up: Drive the vehicle until the transmission reaches operating temperature.
2. Lift & Level: Safely lift and support the vehicle on a level surface.
3. Locate Drain Plug: The drain plug is usually on the bottom of the transmission pan. Place a suitable drain pan underneath.
4. Drain Fluid: Remove the drain plug and allow the fluid to completely drain. This will typically remove around 6.0 quarts.
5. Replace Gasket/Plug: Inspect the drain plug gasket and replace if necessary. Reinstall the drain plug and torque to factory specifications.
6. Locate Fill Port/Dipstick: The fill port on the TR580 most often functions as both the fill and level check point, accessed via a dipstick (often yellow or orange handle) located near the transmission or firewall. Some models may have a fill plug on top accessible from the engine bay.
7. Refill Fluid: Using a funnel, carefully add approximately 6 quarts of new Subaru CVTF-II fluid.
8. Check Level: Start the engine and cycle through all gear selector positions (P, R, N, D, L) pausing briefly in each. With the engine running and at operating temperature, check the fluid level using the dipstick. Add fluid in small increments until the level is between the