2019 Subaru Forester Transmission Fluid & Service Spec

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 11.9 US Quarts (11.3 Liters)
• Filter OEM Part Number: No external serviceable filter; internal filter typically replaced during major overhaul.
• Recommended Service Interval: Inspect every 30,000 miles (48,000 km). Replace every 60,000 miles (96,000 km) for normal driving, or 30,000 miles (48,000 km) for severe duty/towing.

Fluid Type Explained: Subaru CVTF-II

The 2019 Subaru Forester utilizes a Lineartronic Continuously Variable Transmission (CVT) known as the TR580. This advanced transmission requires a very specific fluid to operate correctly and ensure its longevity: Subaru CVTF-II. Unlike traditional automatic transmissions that use Automatic Transmission Fluid (ATF), CVTs use a unique fluid designed for the specific demands of their belt-and-pulley system.

CVTF-II is formulated to provide optimal friction properties for the steel belt or chain that transfers power between the variable-diameter pulleys. Using any other fluid, such as standard ATF or a "multi-vehicle" CVT fluid not specifically meeting Subaru CVTF-II specifications, can lead to serious transmission damage. Incorrect fluid can cause shuddering, poor acceleration, overheating, and ultimately, premature transmission failure. Always insist on genuine Subaru CVTF-II or an aftermarket fluid explicitly stating it meets or exceeds Subaru CVTF-II specifications. Check your owner's manual for the most up-to-date information.

Service Procedure: Drain & Fill vs. Full Exchange

Servicing the CVT on a 2019 Subaru Forester primarily involves a "drain and fill" method. Due to the design of the CVT and the absence of a traditional torque converter drain plug, a complete "full exchange" or "flush" is not typically performed or recommended by Subaru.

The drain and fill procedure involves draining the fluid from the transmission pan and refilling it with new fluid to the correct level. This replaces only a portion of the total fluid volume. As noted above, the drain and fill capacity is approximately 6.0 US Quarts, while the full overhaul capacity is closer to 11.9 US Quarts. This means roughly half of the old fluid remains in the transmission during a simple drain and fill. While not a complete fluid replacement, repeated drain and fills over time will gradually dilute the old fluid with new fluid, providing an adequate level of protection.

Performing a drain and fill requires careful attention to the fluid level, which is checked with the transmission at operating temperature and the vehicle on a level surface. Many Subaru CVTs do not have a traditional dipstick, instead relying on an overflow plug or specific level-checking procedures detailed in the factory service manual. It's crucial to use the correct Subaru scan tool to monitor transmission temperature during the fluid level check to ensure accuracy. If you're not experienced with this procedure, it