🔧 Altima - CVT Fluid Drain and Refill

Do a controlled drain and refill, not a machine flush. Your Altima’s turbocharged CVT requires Nissan CVT Fluid NS-3 or an explicitly NS-3-equivalent fluid; ordinary automatic-transmission fluid can damage it. Nissan lists fluid inspection every 7,500 miles or 12 months and replacement at 60,000 miles under severe service for this configuration. nissanusa.com)

Difficulty Level: Intermediate | Estimated Time: 2-3 hours

Assumption: These instructions cover a routine drain and refill without removing the transmission pan or filter.

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⚠️ Safety & Precautions

• ⚠️ Support your Altima perfectly level on four jack stands. Fluid level will be wrong if the car is tilted.
• 🛑 Never work under a vehicle supported only by a floor jack.
• 🌡️ CVT fluid can cause serious burns. Let an overheated transmission cool before starting.
• 🧴 Use only fresh NS-3-compatible CVT fluid from sealed containers. Do not mix it with NS-2, regular ATF, additives, or manual-transmission oil. owners.nissanusa.com
• 🔩 Loosen the fill plug before draining. If the fill plug cannot be opened, stop before emptying the CVT.
• 🚫 Do not power-flush the CVT or pour cleaners into it.
• 🔋 Battery disconnection is not required.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack rated 2-ton minimum
• Four jack stands rated 2-ton minimum
• Wheel chocks
• Metric socket set from 8mm to 19mm
• 3/8-inch drive ratchet
• 3/8-inch drive torque wrench rated 5-80 ft-lbs
• Plastic trim-clip removal tool
• OBD-II scan tool with CVT fluid-temperature data (specialty)
• CVT fluid transfer pump with threaded adapter (specialty)
• Drain pan rated 10-quart minimum
• Graduated measuring container rated 5-quart minimum
• Digital level
• Digital thermometer
• Safety glasses
• Nitrile chemical-resistant gloves
• Shop light

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Nissan NS-3-compatible CVT fluid - Qty: 5 quarts
• CVT drain-plug sealing washer - Qty: 1
• CVT level-plug sealing washer - Qty: 1
• Brake cleaner - Qty: 1 can
• Absorbent shop towels - Qty: 1 pack

The matching transmission-fluid aisle is open in the parts sidebar. Check the bottle label for an explicit Nissan NS-3 compatibility statement. “Universal ATF” without that statement doesn’t make the cut. Nobody wants to buy a CVT twice.

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📋 Before You Begin

• 📍 Park on level pavement, apply the parking brake, and chock the rear wheels.
• 🚗 Take a short, gentle drive to warm the fluid slightly. Do not begin with the transmission extremely hot.
• 📊 Connect the OBD-II scan tool and confirm that it can display CVT fluid temperature before draining anything.
• 🧰 Raise the entire vehicle and place it level on four jack stands.
• 📐 Use the digital level on a flat rocker-panel or underbody reference surface to confirm the car is level front-to-rear and side-to-side.
• 🧪 Keep each container clean. Dirt introduced through the fill opening can damage the valve body.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the lower splash shield

• Use the metric socket set and plastic trim-clip removal tool to remove the fasteners securing the lower engine cover.
• Arrange the fasteners in removal order so each one returns to its original location.
• Photograph the shield before removing clips.

Step 2: Identify the CVT service plugs

• Use the shop light to identify the CVT drain plug, level or overflow plug, and fill opening.
• The level plug controls the final fluid height. It is not the same fastener as the main drain plug.
• Clean around each opening with brake cleaner and shop towels.
• Do not remove a plug unless you have positively identified it as a CVT service plug.

Step 3: Confirm the fill opening can be opened

• Use the correctly fitting socket from the metric socket set to loosen the CVT fill plug.
• Do not drain the transmission until this plug moves normally and can be reinstalled.
• Inspect the plug and opening for damaged threads.

Step 4: Drain and measure the old fluid

• Position the 10-quart drain pan beneath the CVT drain plug.
• Use the correctly fitting socket and 3/8-inch ratchet to remove the drain plug slowly.
• Allow the fluid to drain until it falls to an occasional drip.
• Transfer the drained fluid into the graduated measuring container and record the exact amount.
• Inspect the fluid. Fine gray residue is common, but metallic flakes, chunks, a strong burnt smell, or milky fluid call for diagnosis before refilling.

Step 5: Reinstall the drain plug

• Remove the old sealing washer and install a new drain-plug sealing washer.
• Clean the plug and sealing surface with brake cleaner and shop towels.
• Start the drain plug by hand to prevent cross-threading.
• Use the 3/8-inch torque wrench to tighten the main drain plug to 34 N·m (25 ft-lbs).

Step 6: Add the initial fluid quantity

• Use the CVT fluid transfer pump to add the same measured amount of fresh NS-3-compatible fluid that was removed.
• If the final level will be set through an overflow tube, add approximately 0.5 quart beyond the measured amount so excess fluid can drain during leveling.
• Do not estimate the complete transmission capacity. A drain and refill removes only part of the total fluid.
• Install the fill plug loosely enough to prevent leakage during the warm-up procedure.

Step 7: Circulate the new fluid

• Confirm the parking brake is applied and keep your foot firmly on the brake pedal.
• Start the engine and leave it idling. Do not raise engine speed.
• Move the selector through P > R > N > D, pausing approximately five seconds in each position.
• Repeat the sequence twice, then return the selector to P.
• Use the OBD-II scan tool to watch CVT fluid temperature continuously.

Step 8: Set the fluid level by temperature

• Keep your Altima level, the engine idling, the parking brake applied, and the selector in P.
• When the scan tool shows approximately 35-45°C (95-113°F), place the drain pan beneath the level plug.
• Use the correct socket and 3/8-inch ratchet to remove the level plug carefully.
• If fluid runs in a steady stream, let it drain until it becomes a thin intermittent trickle.
• If no fluid appears, reinstall the plug temporarily, pump in small amounts of NS-3-compatible fluid, and repeat the check while remaining within the temperature window.
• Install a new level-plug sealing washer, start the plug by hand, and tighten it with the 3/8-inch torque wrench to 8 N·m (71 in-lbs).
• Do not overtighten the small level plug. Its threads are easy to damage.

Step 9: Secure the fill plug and inspect

• Use the correct socket and 3/8-inch torque wrench to tighten the fill plug to the specification marked for the plug design or supplied with its replacement seal.
• Clean all serviced areas with brake cleaner and shop towels.
• With the engine idling, use the shop light to check every opened plug for leakage.

Step 10: Reinstall the splash shield

• Shut the engine off.
• Use the metric socket set and plastic trim-clip removal tool to reinstall the lower splash shield and all original fasteners.
• Use the floor jack to raise each support point, remove the jack stands, and lower the vehicle carefully.

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✅ After Repair

• ✅ Take a gentle 10-minute test drive. Confirm smooth engagement into Reverse and Drive.
• 👂 Watch for delayed engagement, shuddering, slipping, whining, or warning messages.
• 🔍 Park on clean, level ground and inspect underneath for leaks.
• 🧾 Record the mileage, date, fluid specification, and amount installed.
• 💻 A Nissan-capable scan tool should reset the CVT fluid-deterioration value after replacement when that function is supported.
• 🛑 If the old fluid contained metal, the CVT was already slipping, or the new fluid level cannot be established, stop driving and have the transmission diagnosed.

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💰 DIY vs Shop Cost

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

DIY Cost: $110-$190 (fluid, seals, and basic consumables)

You Save: $140-$260 by doing it yourself!

Regional labor prices vary. This service typically takes a shop approximately 1-2 hours.

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🎯 Ready to get started?

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