🔧 Altima - CVT Transmission Fluid Change

This guide covers a basic drain-and-fill CVT fluid change on your Altima, which is the safest method for a beginner. It refreshes part of the old fluid and helps the CVT last longer without doing a full machine flush.

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

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⚠️ Safety & Precautions

• ⚠️ Always support the car with jack stands; never rely only on a jack.
• ⚠️ Work on a cool engine and transmission to avoid burns.
• ⚠️ CVT fluid is slippery; immediately wipe spills to prevent slips.
• ⚠️ Wear safety glasses and nitrile gloves to protect eyes and skin from fluid.
• ⚠️ The car must be level when checking final fluid level; do not check on a slope.
• ⚠️ Do not use regular ATF; Nissan CVTs require the correct CVT fluid only.
• ⚠️ Disconnect the negative battery terminal if you will be working near wiring for a long time.

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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, Qty: 4)
• 🧰 Wheel chocks
• 🧰 10mm socket
• 🧰 12mm socket
• 🧰 14mm socket
• 🧰 3/8" drive ratchet
• 🧰 3/8" drive torque wrench (5–80 ft-lbs range)
• 🧰 Extension bar 6"
• 🧰 Hex bit socket set (metric)
• 🧰 Flathead screwdriver (medium)
• 🧰 Trim clip removal tool
• 🧰 Drain pan (at least 10-liter capacity)
• 🧰 Clean measuring jug with liter markings (at least 5 liters)
• 🧰 Long-neck fluid funnel
• 🧰 Hand pump or fluid transfer pump (specialty)
• 🧰 Infrared thermometer (specialty)
• 🧰 OBD2 scan tool with transmission temperature reading (specialty)
• 🧰 Shop rags
• 🧰 Nitrile gloves
• 🧰 Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 🔩 Nissan NS-3 CVT fluid (or equivalent CVT NS-3) - Qty: 5–6 liters (for one drain-and-fill)
• 🔩 Transmission drain plug crush washer - Qty: 1
• 🔩 Shop towels - Qty: 1 pack
• 🔩 Brake cleaner spray - Qty: 1 can
• 🔩 Fender cover - Qty: 1

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📋 Before You Begin

• Park the Altima on a flat, level surface, set the parking brake, and place wheel chocks behind the rear wheels.
• Gather all tools and parts so you don’t need to crawl in and out repeatedly.
• If you have a scan tool that reads CVT fluid temperature, keep it ready; we will use it later for a more accurate level check.
• Loosen, but do not remove, the wheel lug nuts if you plan to raise the front end significantly for more space.
• If you will be working with the hood open for a long time near wiring, disconnect the negative battery cable using a 10mm socket.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise and Support the Altima

• Use the floor jack to lift the front of the car at the front center jacking point (behind the front bumper on the subframe).
• Place jack stands under the left and right front pinch welds or frame points and carefully lower the car onto them.
• Repeat as needed to raise the rear so the car is roughly level, then place jack stands at the rear support points.
• Give the car a gentle push to confirm it is solidly supported.

Step 2: Remove the Engine Undercover

• Use a 10mm socket to remove the bolts holding the plastic splash shield under the engine.
• Use the trim clip removal tool to pop out any plastic clips.
• Lower the cover and set it aside where it won’t get stepped on.

Step 3: Locate CVT Drain Plug and (if equipped) Level Plug

• Slide the drain pan under the transmission oil pan (toward the driver’s side).
• The CVT drain plug is a metal plug on the bottom of the transmission pan; typically removed with a 14mm socket or hex bit socket.
• Some versions have a small inner level plug (Allen/hex) inside or near the drain plug; if you see a smaller plug inside a larger one, that is the level plug.
• Clean the area now to spot leaks later.

Step 4: Loosen the Fill Point on Top

• Open the hood and support it.
• On top of the transmission, locate the CVT fill plug or fill tube (often under the air intake duct, on the driver’s side of the engine bay).
• Use a flathead screwdriver and 10mm socket to loosen air duct clamps and bolts if you need more access.
• Loosen (do not yet remove) the fill plug using the appropriate hex bit socket or ratchet.
• Always open the fill plug first; never drain if you cannot fill.

Step 5: Drain the Old CVT Fluid

• Position the drain pan directly under the CVT drain plug.
• Use a 14mm socket (or appropriate hex bit) and ratchet to loosen and remove the drain plug.
• Let the fluid drain completely; this can take 10–15 minutes as it drips.
• While it drains, clean the drain plug with a rag and inspect any magnet on the plug for metal shavings (a light paste is normal; large chunks are not).

Step 6: Measure the Drained Fluid

• Carefully pour the old fluid from the drain pan into the measuring jug.
• Record exactly how many liters came out. We will refill the same amount as a baseline.
• Expect roughly 4–5 liters on a typical drain-and-fill.

Step 7: Reinstall the Drain Plug

• Install a new crush washer onto the cleaned drain plug.
• Thread the plug in by hand to avoid cross-threading.
• Use the 14mm socket and torque wrench to tighten the drain plug to the specified torque: Torque to 34 Nm (25 ft-lbs).
• Wipe the area clean with a shop rag and a little brake cleaner spray.

Step 8: Add New CVT Fluid (Engine Off)

• Remove the loosened top fill plug fully.
• Insert the long-neck funnel or connect your fluid transfer pump into the fill hole.
• Slowly pour in the same amount of new NS-3 CVT fluid you measured coming out in Step 6.
• Pause occasionally so the fluid can settle; you don’t want it to burp back out.
• Reinstall the fill plug by hand, then snug it with the appropriate hex bit socket or ratchet. If you have the spec, tighten to approximately Torque to 34 Nm (25 ft-lbs) unless otherwise marked.

Step 9: Initial Check and Warm-Up

• Lower the car slightly if needed but keep it supported safely and as level as possible.
• Reconnect the negative battery cable using a 10mm socket if you disconnected it earlier.
• Start the engine and let it idle in Park for about 2–3 minutes.
• With your foot on the brake, move the shifter slowly through all positions: P → R → N → D → L (if equipped), pausing 3 seconds in each, then back to Park.
• This fills the hydraulic circuits with fresh fluid.

Step 10: Final Level Check – With Scan Tool (Best Method)

• Connect your OBD2 scan tool and select transmission or CVT data.
• Monitor the CVT fluid temperature as the engine idles.
• When the CVT fluid temperature reaches about 35–45°C (95–113°F), leave the engine idling and the car in Park.
• If your CVT pan has an inner level plug (small Allen type):
  • Place the drain pan under the level plug.
  • Use the correct hex bit socket to remove the small level plug while the engine idles.
  • A small, steady trickle means the level is correct; let it drip until it becomes a slow drip.
  • If no fluid comes out, add fluid from the top in small amounts using the funnel or pump until a small stream appears from the level port.
  • Reinstall the level plug and tighten it to Torque to 7–10 Nm (5–7 ft-lbs).
• If there is no separate level plug, rely on the measured amount you filled; Nissan’s procedure is to use temperature and flow, but many field techs match the drained volume as long as there are no leaks.

Step 11: Final Level Check – Without Scan Tool (Simplified)

• If you don’t have a scan tool, run the engine in Park for about 10 minutes after Step 9 to warm the fluid moderately.
• If equipped with a level plug, quickly:
  • Place the drain pan under the level plug area.
  • Remove the level plug with the hex bit socket while the engine idles.
  • You should see a small stream that turns into a drip; if nothing comes out, add a small amount from the top and recheck.
• If no level plug exists, and you added exactly what you drained, leave it as is; this is not as precise as the official method but is commonly used when tools are limited.

Step 12: Reassemble and Lower the Car

• Turn off the engine.
• Reinstall the engine undercover using the 10mm socket for bolts and the trim clip removal tool to press clips back in.
• Remove the jack stands using the floor jack and carefully lower the car to the ground.
• Double-check under the car for any signs of fresh leaks.

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✅ After Repair

• Start the engine, let it idle, and check under the car for leaks around the drain and fill areas.
• Take a short, gentle test drive of 10–15 minutes, using both city and light highway speeds.
• Listen for any new noises and feel for shudder or slipping; the CVT should feel smooth.
• After the drive, park on a level surface and do one more quick leak check under the car.
• If you have a scan tool, verify CVT temperature and, if possible, recheck level while warm using the level plug method.

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💰 DIY vs Shop Cost

Shop Cost: $250–$400 (parts + labor)

DIY Cost: $90–$160 (fluid + washer + supplies)

You Save: $160–$240 by doing it yourself!

Shop labor rates vary but typically run $100–$150/hour. This repair takes a shop approximately 1.5–2.0 hours.

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🎯 Ready to get started?

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