🔧 Sentra - CVT Transmission Fluid Drain & Refill

On your Sentra’s CVT, the safe DIY service is a drain-and-refill (not a power flush). You’ll drain the old fluid, refill with the correct Nissan-spec CVT fluid, then verify the level with the fluid warmed to the proper temperature range.

Difficulty Level: Intermediate | Estimated Time: 1.5-2.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work on level ground and support the car with jack stands before going underneath.
• ⚠️ CVT fluid can be hot. Let the car cool if needed and wear gloves/eye protection.
• ⚠️ Use only Nissan NS-3 CVT fluid. Wrong fluid can damage the CVT.
• ⚠️ Keep dirt out of the CVT. Clean around the fill area before opening it.

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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 (10-quart minimum)
• Socket set (8mm-19mm)
• Ratchet (3/8")
• Torque wrench (3/8", 10-100 Nm range)
• Trim clip tool
• Long-neck funnel
• Measuring container (quart/liter marked)
• Infrared thermometer (specialty)
• OBD-II scan tool that reads CVT fluid temperature (specialty)
• Shop towels

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• CVT transmission fluid (Nissan NS-3) - Qty: 5 quarts
• CVT drain plug crush washer - Qty: 1
• Brake cleaner - Qty: 1

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📋 Before You Begin

• Park your Sentra on a flat, level spot and set the parking brake.
• Place wheel chocks behind the rear wheels.
• Plan to check fluid level with the CVT fluid around 35–45°C (95–113°F).
• If you don’t have a scan tool: you can use an infrared thermometer (it reads surface temperature by “shooting” a laser at the pan) aimed at the CVT pan near the drain area.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Warm the CVT fluid slightly

• Start the engine and let it idle for about 5 minutes.
• With your foot on the brake, move the shifter through P-R-N-D-L and back to P, pausing 2 seconds in each position.
• Shut the engine off.

Step 2: Lift and safely support the front

• Use a floor jack (rated 3-ton minimum) to lift the front.
• Set the vehicle onto jack stands (rated 3-ton minimum) at the proper lift points.
• Give the car a gentle shake to confirm it’s stable before going underneath.

Step 3: Remove the lower splash shield (if equipped)

• Use a trim clip tool to remove plastic clips.
• Use your socket set (8mm-19mm) with a ratchet (3/8") to remove any bolts/screws.
• Set the shield and hardware aside in a neat pile.

Step 4: Drain the old CVT fluid

• Position a drain pan (10-quart minimum) under the CVT drain plug.
• Use your socket set (8mm-19mm) with a ratchet (3/8") to remove the drain plug.
• Let the fluid drain until it slows to a drip (typically 10–20 minutes).
• Use brake cleaner and shop towels to clean the drain plug area.

Step 5: Reinstall the drain plug with a new crush washer

• Install a new CVT drain plug crush washer on the drain plug.
• Thread the drain plug in by hand first (to avoid cross-threading).
• Tighten using a torque wrench (3/8", 10-100 Nm range): Torque to 34 Nm (25 ft-lbs).
• Tip: Always torque—don’t “guess tight.”

Step 6: Measure what came out (important)

• Pour the drained fluid into a measuring container (quart/liter marked).
• Write down the amount. You’ll refill with the same amount as a starting point.

Step 7: Refill with Nissan NS-3 CVT fluid

• Open the hood.
• Access the CVT fill point (commonly the CVT dipstick tube area). If something blocks access, remove it using your socket set (8mm-19mm) and ratchet (3/8").
• Insert a long-neck funnel and add Nissan NS-3 CVT fluid equal to what you measured.
• Reinstall the dipstick/fill cap securely.

Step 8: Bring fluid to the correct temp and set the final level

• Start the engine and let it idle.
• With your foot on the brake, shift through P-R-N-D-L and back to P.
• Option A (preferred): Use an OBD-II scan tool that reads CVT fluid temperature (specialty) and monitor CVT fluid temp until it’s 35–45°C (95–113°F).
• Option B: Use an infrared thermometer (specialty) and aim it at the CVT pan; continue once the pan is approximately in the 35–45°C (95–113°F) range.
• Check the CVT fluid level using the dipstick procedure for your Sentra (wipe, reinsert fully, remove, read).
• Add NS-3 in small amounts using the long-neck funnel until it’s at the correct mark for that temperature range.
• Tip: Add a little, wait 30 seconds, recheck.

Step 9: Reinstall the splash shield and lower the car

• Reinstall the splash shield using the socket set (8mm-19mm), ratchet (3/8"), and trim clip tool.
• Lower the vehicle using the floor jack (rated 3-ton minimum).

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✅ After Repair

• Start the engine and check underneath for leaks.
• Take a 10–15 minute test drive. Make sure acceleration is smooth and there’s no slipping or shudder.
• Recheck the CVT fluid level at the correct temperature range and adjust if needed.
• Dispose of used CVT fluid properly (most parts stores accept it).

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💰 DIY vs Shop Cost

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

DIY Cost: $60-$130 (parts only)

You Save: $120-$350 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-1.5 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.