🔧 Legacy - CVT Transmission Fluid Drain & Refill

This service replaces a portion of your CVT fluid by draining the pan and refilling to the correct level. On your Legacy’s CVT, the fluid level must be set at a specific fluid temperature, or you can end up overfilled or underfilled.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

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⚠️ Safety & Precautions

• ⚠️ Work on a level surface and support the car with jack stands before going underneath.
• ⚠️ CVT fluid gets very hot; wear gloves and let it cool if needed.
• ⚠️ Keep the fill area clean—dirt in CVT fluid can damage the transmission.
• ⚠️ Do not use “universal ATF” in the CVT; use the correct Subaru CVT fluid.
• ⚠️ Battery disconnect is not required for this service.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves
• Drain pan (at least 10-quart)
• Funnel with long hose
• Shop rags
• Metric socket set (8mm–19mm)
• Ratchet (3/8")
• Torque wrench (10–100 ft-lbs)
• Trim clip tool
• 14mm hex bit socket
• 17mm socket
• OBD2 scan tool that reads CVT fluid temp (specialty)
• OBD2 Bluetooth adapter (specialty)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Subaru CVT fluid (CVTF-II) - Qty: 6 quarts
• CVT drain plug crush washer - Qty: 1
• CVT fill/level plug crush washer - Qty: 1
• Brake cleaner - Qty: 1 can

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear tires.
• Plan to set the final fluid level with the car level (not nose-up on ramps).
• Install your OBD2 tool and confirm you can read CVT fluid temperature (often shown as “CVT Fluid Temp” or similar). An OBD2 app/scan tool reads data from the car.
• Cleanliness matters—wipe around plugs first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Warm the CVT fluid (for accurate level setting)

• Start the engine and drive 10–15 minutes.
• Use your OBD2 scan tool that reads CVT fluid temp (specialty) and monitor temperature during the process later.

Step 2: Raise and level the car

• Use a floor jack (rated 3-ton minimum) to lift the front and rear as needed.
• Set the car securely on jack stands (rated 3-ton minimum) at all four corners so it sits level.
• Use wheel chocks to prevent rolling.

Step 3: Remove the under cover (if equipped)

• Use a trim clip tool to pop the plastic clips.
• Use a 10mm socket and ratchet (3/8") to remove any bolts.
• Set clips/bolts aside so you don’t lose them.

Step 4: Identify the drain plug and the level/check plug

• Place the drain pan (at least 10-quart) under the CVT.
• Clean the area with shop rags and brake cleaner.
• Depending on build, your CVT drain plug may take a 17mm socket or a 14mm hex bit socket.
• Always loosen the fill/level plug first.

Step 5: Loosen the fill/level plug (important)

• Use the appropriate tool (commonly a 14mm hex bit socket with a ratchet (3/8")) to crack it loose.
• If it will not loosen, stop here—don’t drain the CVT if you can’t refill it.

Step 6: Drain the CVT fluid

• Use a 17mm socket or 14mm hex bit socket with a ratchet (3/8") to remove the drain plug.
• Let it drain until it slows to a drip.
• Replace the drain plug crush washer with the new one.
• Reinstall the drain plug and Torque to 45 Nm (33 ft-lbs).

Step 7: Refill with the correct CVT fluid

• Refill through the CVT fill point using a funnel with long hose.
• If your Legacy has a fill plug on the transmission, fill through that opening.
• If your Legacy has a CVT fluid dipstick tube, fill through the tube opening.
• Add about the same amount you drained (most drain-and-refills are roughly 4–6 quarts).

Step 8: Circulate fluid through the CVT

• Start the engine.
• With your foot on the brake, move the shifter slowly through P-R-N-D, pausing 3 seconds in each, then back to P.
• Keep the engine idling.

Step 9: Set the final fluid level at the correct temperature

• Use the OBD2 scan tool that reads CVT fluid temp (specialty) and watch CVT fluid temperature.
• When the CVT fluid temperature is in the typical level-check window of 35–45°C (95–113°F), remove the level/check plug using the correct tool (often 14mm hex bit socket).
• Correct level behavior: a small steady drip is OK; a heavy stream means overfilled; no fluid means low.
• If low, add small amounts of fluid with the funnel with long hose until it just begins to drip from the level/check port.
• Install a new crush washer on the level/check plug, reinstall it, and Torque to 25 Nm (18 ft-lbs).

Step 10: Reinstall the under cover

• Reinstall the splash shield using the 10mm socket, ratchet (3/8"), and the plastic clips with the trim clip tool.

Step 11: Lower the car

• Use the floor jack (rated 3-ton minimum) to lift slightly, remove jack stands (rated 3-ton minimum), then lower the car.

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✅ After Repair

• Start the engine and check underneath for leaks around the drain and level/check plugs.
• Test drive 10–15 minutes, then recheck for leaks.
• If you feel slipping, shudder, or delayed engagement after service, stop driving and recheck level (CVT level is very sensitive).
• Dispose of used fluid properly at a recycling center or parts store.

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

DIY Cost: $80-$180 (parts only)

You Save: $170-$270 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.