🔧 Sentra - Transmission Fluid Change (Drain & Refill)

Your Sentra came with either the Xtronic CVT (most common) or a 6‑speed manual. The correct fluid and the level-check method are completely different, so below are two separate procedures—follow the one that matches what’s in your car.

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

Assumption: Transmission type not provided; steps include both CVT and manual paths.

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⚠️ Safety & Precautions

• ⚠️ Work on a level surface; support the car with jack stands before going underneath.
• ⚠️ Transmission fluid can be hot—let the car cool so you don’t get burned.
• ⚠️ Keep the car level during filling/level check or the fluid level will be wrong.
• ⚠️ Never use “universal ATF” in the CVT; the CVT requires Nissan-spec CVT fluid.
• ⚠️ If you must run the engine while raised (CVT level check), keep wheels chocked and stay clear of moving parts.

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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)
• Funnel with long flexible hose
• OBD2 scan tool with live data (specialty)
• Torque wrench (10-150 ft-lbs range)
• Metric socket set (8mm-19mm)
• 3/8" drive ratchet
• 3/8" drive extensions
• Phillips screwdriver
• Trim clip removal tool
• Hex key socket set (4mm-10mm)
• Hand pump fluid transfer pump (specialty)
• Shop rags
• Brake cleaner spray

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Nissan CVT fluid (NS-3 equivalent) - Qty: 5 quarts
• Transmission drain plug crush washer - Qty: 1
• Transmission fill plug washer - Qty: 1
• Manual transmission gear oil (75W-80 GL-4) - Qty: 3 quarts

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📋 Before You Begin

• Park on a flat, level surface and set the parking brake.
• Chock the rear wheels using wheel chocks.
• Raise the front with a floor jack and support with jack stands at the factory lift points.
• Locate the transmission: CVT has a large case and usually a CVT fluid cooler line; manual has shift linkage and typically a simpler case.
• Set up your OBD2 scan tool to view transmission fluid temperature (CVT path). Live data = real-time sensor readings.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the lower splash shield (if equipped)

• Use a trim clip removal tool to pop out plastic clips.
• Use a Phillips screwdriver and metric socket set (8mm-10mm) to remove any screws/bolts.
• Set the shield and fasteners aside in a small pile.

Step 2: Identify whether you have CVT or manual

• CVT: usually labeled “CVT” on a warning label and uses CVT fluid; manual uses gear oil.
• If you see a dipstick labeled “CVT,” follow the CVT steps below (many do not have a dipstick).

Step 3 (CVT): Loosen the fill plug first

• Place a drain pan under the transmission area using a drain pan (10-quart minimum).
• Find the CVT fill plug (commonly on the side/front of the case).
• Use a metric socket set (10mm-19mm) and 3/8" drive ratchet to crack it loose first.
• Tip: If it won’t loosen, don’t drain yet.

Step 4 (CVT): Drain the CVT fluid

• Position the drain pan under the CVT drain plug.
• Use a metric socket set (10mm-19mm) and 3/8" drive ratchet to remove the drain plug.
• Let it drain until it slows to an occasional drip.
• Clean the drain plug with shop rags and brake cleaner spray.
• Replace the drain plug crush washer with a new transmission drain plug crush washer.
• Reinstall the drain plug using a torque wrench and metric socket set and Torque to Nissan specification.

Step 5 (CVT): Refill with NS-3 CVT fluid

• Use a funnel with long flexible hose or hand pump fluid transfer pump (specialty) to add fluid through the fill hole.
• Add the amount you drained (measure what came out in the drain pan). A typical drain/refill is about 4-5 quarts.
• Install the fill plug loosely using a 3/8" drive ratchet for now.

Step 6 (CVT): Set the CVT fluid level using temperature

• Lower the car enough that it sits level (or keep it level on four stands) using a floor jack and jack stands.
• Connect your OBD2 scan tool with live data (specialty) and monitor CVT fluid temperature.
• Start the engine and, with your foot on the brake, move the shifter slowly through all positions and back to Park (this circulates fluid).
• When CVT fluid temperature is in the typical level-check range (commonly about 35-45°C / 95-113°F), check level at the level/overflow plug if your CVT uses one.
• Use a hex key socket set (4mm-10mm) or metric socket set (10mm-19mm) (varies by plug style) to remove the level/overflow plug.
• Correct level is usually a thin steady dribble at the specified temperature; add fluid with the hand pump fluid transfer pump (specialty) until it just begins to dribble.
• Reinstall the level/overflow plug using a torque wrench and Torque to Nissan specification.
• Tighten the fill plug using a torque wrench and Torque to Nissan specification.

Step 7 (Manual): Loosen the fill plug first

• Locate the manual transmission fill plug (typically on the side of the case, above the drain plug).
• Use a hex key socket set (4mm-10mm) or metric socket set (10mm-19mm) (varies by plug) with a 3/8" drive ratchet to loosen it.
• Tip: Always confirm fill plug opens before draining.

Step 8 (Manual): Drain the gear oil

• Place the drain pan (10-quart minimum) under the drain plug.
• Use a metric socket set (10mm-19mm) and 3/8" drive ratchet to remove the drain plug and drain fully.
• Clean the drain plug and magnet (if magnetic) with shop rags and brake cleaner spray.
• Install a new transmission drain plug crush washer if equipped.
• Reinstall drain plug using a torque wrench and Torque to Nissan specification.

Step 9 (Manual): Fill until fluid reaches the fill opening

• Use a hand pump fluid transfer pump (specialty) to pump in manual transmission gear oil (75W-80 GL-4).
• Fill until the oil just starts to seep out of the fill hole (that’s the correct level on most manuals).
• Install a new transmission fill plug washer if equipped.
• Reinstall the fill plug using a torque wrench and Torque to Nissan specification.

Step 10: Reinstall the splash shield

• Reinstall the shield using a Phillips screwdriver, trim clip removal tool, and metric socket set (8mm-10mm).
• Make sure no clips are missing (loose shields can rub and make noise).

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✅ After Repair

• Start the engine and check underneath for leaks with a flashlight (use safety glasses).
• Take a short, gentle test drive and confirm smooth operation (no slipping, no delayed engagement).
• Recheck for leaks after the drive.
• If CVT: recheck level procedure if you notice any flare/slip or whining.

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💰 DIY vs Shop Cost

Shop Cost: $220-$450 (parts + labor)

DIY Cost: $60-$140 (parts only)

You Save: $160-$310 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 hours.

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