Quick answer: Transmission Fluid Change on a 2020–2024 Mazda3 is rated Moderate and takes about 2-3 hours. You'll need 8 tools for this job, and parts cost about $12. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name |
Part Number |
Price |
Buy |
| Mazda ATF-FZ Automatic Transmission Fluid |
0000-FZ-113E-01 |
$10.00 |
|
| Transmission Drain Plug Gasket |
— |
$2.00 |
|
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
1
Prepare (ATF FZ ONLY!)
The 2020–2024 Mazda3 (BP, 6-speed SkyActiv-Drive FW6A-EL) transmission fluid change: use Mazda Genuine ATF FZ ONLY (blue, low-viscosity — part 0000-FZ-113E-01). Do NOT use Dexron, Mercon, or universal — Mazda warns other fluids cannot be guaranteed. You'll need: Mazda ATF FZ (buy 4 quarts — you'll drain ~3-3.5 qt), 8mm hex socket, drain pan, funnel. The Mazda3 HAS a small bolted dipstick (marked 'FZ') — but you must remove the engine air-filter box to reach it. Level check requires ATF at ≥50°C (122°F) with engine idling. Mazda calls it 'filled for life' — but many owners change it preventively. Park on level ground.
🔧 Mechanic's note — Ray Delgado
I prep the Mazda3 transmission service — ATF FZ only — and I save the old fluid in the new fluid's jugs. I drop them at the parts store; most take it free, and the storm drain is never an option.
2
Remove Airbox, Drain via 8mm Bolt
Remove the engine air-filter box for access to the transmission dipstick (the FZ dipstick is underneath it). Locate the 8mm hex drain bolt (bottom of the transmission pan). Position the drain pan. Remove the drain bolt — let the ATF drain (expect ~3-3.5 quarts). The Mazda3's FW6A-EL drains a small amount — the unit holds more in the torque converter. The blue ATF FZ should still look blue if healthy.
3
Reinstall Drain Bolt
Torque spec wasn't verified — tighten snugly (don't over-tighten). The FW6A-EL's drain is an 8mm hex — not high-torque. Don't strip it.
🔧 Mechanic's note — Tom Becker
I reinstall the Mazda3 transmission drain bolt with the torque wrench — I have seen the aluminum case threads give up from a bolt tightened by feel. The spec is small and the consequence is large, so I never guess.
4
Fill via FZ Dipstick
Fill through the FZ dipstick hole — add Mazda ATF FZ, the same amount that drained (~3-3.5 qt). Use ONLY ATF FZ (blue). Measure what drained and match it.
5
Set Level at ≥122°F (engine idling!)
Set the level: on level ground, engine IDLING in Park, ATF at ≥50°C (122°F) — read via scan tool. Remove the FZ dipstick (unbolt it), wipe, reinsert, remove again — fluid should be between the marks (adhering to the central marker). The 50°C minimum is per Mazda service alert. Don't check cold. Reinstall the dipstick and torque its bolt to 8-10 N·m (71-88 in-lbs). The bolted FZ dipstick with temp requirement is the Mazda3's procedure.
6
Reassemble and Test
Reinstall the air-filter box. Check for leaks. The Mazda3 should shift smoothly. Mazda's 'filled for life' means no factory interval and no flush recommended — but owners commonly do a drain-and-fill every 30,000-80,000 miles. A single drain-and-fill replaces ~1/3 of the fluid; 3x with a short drive between exchanges ~80%. The ATF-FZ-only requirement (blue fluid), the hidden FZ dipstick (under the airbox), and the ≥50°C idling level check are the Mazda3's defining details. The FW6A-EL is shared with the CX-9 (same FZ fluid) — but the Mazda3's dipstick access is unique. Don't use ATF M-V (older Mazdas) — wrong for SkyActiv-Drive.
🔧 Mechanic's note — Tom Becker
I reassemble the Mazda3 and test — I check the transmission for leaks right away and again after the first heat cycle. I have seen a drain plug weep only when the fluid is hot and thin, and the second check catches it.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Overfilling the transmission fluid
- • Using incorrect transmission fluid type
- • Failing to replace the drain plug gasket
- • Not properly torquing the drain and fill plugs
- • Neglecting to check the fluid level after refilling
