Tesla Gear Oil Change: DIY Guide (Model S/X/3/Y)

Tesla doesn't include gear oil changes in their standard maintenance schedule, but that doesn't mean the fluid lasts forever. The reduction gear in your Tesla's drive unit relies on oil to lubricate the gears and bearings. Over time, this oil breaks down and collects metal particles from normal wear.

Why Change Tesla Gear Oil?

Benefits of Fresh Gear Oil:

• Reduced wear on gears and bearings
• Quieter operation
• Better efficiency (slightly)
• Extended drive unit lifespan
• Peace of mind for high-mileage owners

Signs Your Gear Oil May Need Changing:

• Whining or humming from drive unit
• Noise increases with speed
• Car has 50,000+ miles
• Previous owner's maintenance unknown

Tesla Gear Oil Specifications

Tesla uses ATF-9 (P/N 1135241-00-A) for 3DU drive units up to Model Year 2023. For MY2024+, Tesla specifies KAF1 (P/N 1646886-02-A). KAF1/KAF1 V1.2 are backwards compatible and can substitute ATF-9.

Note: As of 2024, Tesla is transitioning all service centers to KAF1/KAF1 V1.2 gearbox fluid. This is backwards compatible with ATF-9.

Specifications:

• Type: Full synthetic automatic transmission fluid
• Standard: ATF-9 or KAF1 — Tesla OEM part numbers only (third-party ATF-9 equivalents should be verified against Tesla's approved list)

Capacity by Model:

Per Tesla's service documentation, capacities are much larger than often reported online:

Note: 3DU = standard reduction drive unit (Model 3/Y). 4DU = larger drive unit (high-performance Model S/X variants). Always confirm your drive unit type before ordering fluid quantity.

Important: Tesla's official procedure uses specialized tools including an oil pump switchbox to run the electric oil pump during fill. A simple gravity fill may not fully fill the system.

DIY Gear Oil Change Guide

Safety First

• Work on level ground
• Use proper jack stands (never rely on a jack alone)
• Allow car to cool if recently driven
• Wear gloves and eye protection

Step 1: Prepare the Vehicle

1. Park on level ground
2. Put car in Park and enable "Jack Mode" (Controls > Service > Jack Mode)
3. Lift the car and secure on jack stands
4. Remove aerodynamic underbody panels as needed

Step 2: Locate Drain and Fill Plugs

Rear Drive Unit:

• Oil pump bolts (drain method): Bottom of drive unit housing — EPL10 socket, 2 bolts (5 Nm + 20 degrees)
• Fill plug: Side of drive unit, slightly higher (10mm hex, 15 Nm)

⚠️ Official Procedure Note: Tesla's official service manual procedure for draining involves removing the oil pump (2 bolts, EPL10 socket) and oil filter — not a simple drain plug. For a complete drain per Tesla's official procedure, the oil pump must be removed. Consider this if doing a thorough service.

Front Drive Unit (AWD models):

• Same arrangement but smaller unit
• Located behind front subframe

Step 3: Drain Old Fluid

1. Place drain pan under drive unit
2. Remove the fill plug first (breaks vacuum, allows complete drain)
3. Remove the drain plug
4. Allow fluid to drain for at least 10 minutes (Tesla spec) or until slow drip
5. Inspect drained fluid for metal particles

Step 4: Replace Drain Plug

1. Clean drain plug threads
2. Install new crush washer (recommended)
3. Reinstall drain plug
4. Torque to specification: 25 Nm (18 ft-lb)

Step 5: Fill With New Fluid

1. Using a fluid transfer pump, add new gear oil through fill plug
2. Fill slowly until fluid begins to seep from fill hole
3. This indicates the correct level
4. Allow excess to drip out

Step 6: Replace Fill Plug

1. Clean fill plug threads
2. Install new crush washer
3. Reinstall fill plug
4. Torque to specification: 15 Nm (11 ft-lb)

Step 7: Repeat for Front Drive Unit (AWD)

Same process for front unit if equipped.

Step 8: Test Drive

1. Lower car and disable Jack Mode
2. Drive for 10-15 minutes
3. Listen for any unusual noises
4. Recheck plugs for leaks after driving

Recommended Change Intervals

Tesla doesn't specify an interval, but experienced owners recommend:

Common Mistakes to Avoid

1. Removing drain plug first - Always remove fill plug first to break vacuum
2. Wrong fluid type - Only use approved gear oil (not motor oil)
3. Overfilling - Fill only until fluid seeps from fill hole
4. Reusing crush washers - New washers ensure proper seal
5. Skipping torque specs - Over-tightening can strip soft aluminum

What About the "Lifetime" Fluid Claim?

Tesla calls their gear oil "lifetime fill," but this is marketing, not engineering:

• What "lifetime" means: Expected to last the warranty period
• What it doesn't mean: Optimal for entire vehicle life
• Reality: Fluid degrades over time and miles

Many Tesla owners with 100,000+ trouble-free miles credit regular gear oil changes for their drive unit longevity.

Cost Comparison

Parts Needed for DIY:

• ATF-9 (P/N 1135241-00-A) or KAF1 (P/N 1646886-02-A) — buy 3L to be safe: €50-90
• Crush washers (4x): $5-10
• Fluid pump (one-time): $20-30

Pro Tips

Warming the Fluid: Drive for 10 minutes before draining. Warm fluid flows better and carries more contaminants out.

Keep a Sample: Save some old fluid in a clear container. This provides a baseline for future changes and can indicate developing problems.

Check Magnet: Some drain plugs are magnetic. Examine for metal particles—fine dust is normal, chunks are not.

Label Your Fluids: Front and rear units take the same fluid, but keep track of how much goes in each.

Gear oil changes are one of the most overlooked Tesla maintenance items. It's a straightforward job that can add years to your drive unit's life. If you can change oil in a gas car, you can do this.

Related Guides

• Tesla Drive Unit Noise Fix — Whining/humming diagnosis and fluid change procedure
• Brake Pad Replacement - Another overlooked maintenance item
• Cabin Air Filter - Easy maintenance to do at the same time
• Tire Rotation - Schedule together for efficiency

Torque values and fluid specs verified against Tesla Service Manual (service.tesla.com) — March 2026