Parts for your 2020 Subaru Legacy-Transmission filter

Transmission Filter on the 2020 Subaru Legacy: What You Need to Know

When it comes to the 2020 Subaru Legacy, many folks wonder about the presence and role of a transmission filter. After examining technical sources and the vehicle's official service information, it turns out that the 2020 Subaru Legacy does not actually use a traditional transmission filter in its Continuously Variable Transmission (CVT). This might come as a surprise to some, since many cars with automatic transmissions typically have a transmission filter to help keep the transmission fluid clean.

So why doesn't the 2020 Subaru Legacy have a standard transmission filter? The reason lies in the design of Subaru's Lineartronic CVT. Unlike conventional automatic transmissions that rely on a separate transmission filter to catch contaminants, Subaru's CVT uses a different approach. Instead of using a replaceable or serviceable filter, the CVT incorporates an integrated screen or mesh within the transmission fluid pump. This screen performs the function of filtering the fluid, but it is designed to last the life of the transmission without needing regular servicing or replacement.

This screen is much more resilient and less prone to clogging compared to traditional paper filters. Subaru engineers designed it this way to reduce maintenance requirements and enhance reliability. Plus, the transmission fluid used in the Lineartronic CVT is engineered to reduce wear and contamination, further lowering the need for a separate filter to trap debris. It's a system optimised for long-lasting performance without aftermarket interventions.

While the absence of a traditional transmission filter might seem like a missing piece in the regular maintenance puzzle, the key thing in the 2020 Subaru Legacy is still the transmission fluid itself. Regularly changing the CVT fluid at recommended intervals is critical for maintaining smooth operation and preventing premature wear of transmission components. So, while you won't be replacing a transmission filter, the fluid maintenance is just as important and deserves attention.

If a 2020 Subaru Legacy did have a transmission filter, here's what you would expect to know about it, just for clarity.

The transmission filter is a small but mighty part that sits inside the transmission case, working quietly to catch bits of metal, clutch material, and other small contaminants that can accumulate in the transmission fluid over time. These particles come from the natural wear and tear of the vehicle's internal parts. The filter's job is to prevent those contaminants from circulating through the system and causing damage or clogging up tiny passages.

A clogged or dirty transmission filter can limit fluid flow, resulting in poor transmission performance like delayed gear changes, slipping, or even overheating. That's why transmission filter maintenance is usually an essential part of automatic transmission servicing in many vehicles. Typically, the filter is replaced when the fluid is changed to ensure the system stays clean and the transmission lasts longer.

But again, for the 2020 Subaru Legacy, because there is no traditional transmission filter, the best way to care for the transmission is to follow the recommended CVT fluid change schedule laid out by Subaru. This recommended service interval depends on driving conditions but is generally advised every 48,000 to 64,000 kilometres (30,000 to 40,000 miles) or so, with more frequent changes in tougher environments such as dusty or stop-start city driving.

Changing the CVT fluid regularly helps flush away contaminants and maintain the vital hydraulic function of the transmission. Subaru recommends using their specific CVT fluid, as it has been engineered to suit the unique requirements of the Lineartronic CVT. Using the wrong fluid can lead to poor performance or damage.

During a fluid change service, the technician will drain the old fluid and replace it with fresh fluid. Some services may also involve inspecting the transmission pan for debris and cleaning the integrated mesh screen if needed. Although the screen is built to last, ensuring it is clean helps maintain good fluid flow and transmission function.

Many Subaru experts advise not to neglect the fluid service because CVT transmissions rely heavily on their fluid for cooling and smooth operation. Without that, you might experience issues down the track that could be costly to fix.

So for owners of a 2020 Subaru Legacy, the takeaway is clear: there is no transmission filter to maintain or replace. Instead, focus on sticking to the fluid service schedule, use the correct CVT fluid, and ensure any transmission service is done by a technician familiar with Subaru's CVT system. This approach will help keep the transmission running smoothly and reliably for years to come.