Parts for your 2021 Suzuki Splash-Transmission fluid

2021 Suzuki Splash transmission fluid: what it is, why it matters, and when to change it

Transmission fluid is relevant and used on the 2021 Suzuki Splash. Suzuki technical publications specify lubricants for both transmission types fitted to the Splash: the 4‑speed automatic uses ATF meeting JWS 3309 (sold by Suzuki as ATF 3317, equivalent to Toyota T‑IV), and the 5‑speed manual uses API GL‑4 75W‑90 gear oil. References: Suzuki Splash/Ritz Owner’s Manual (EU release), Lubricant Specifications section, Suzuki Genuine Fluids guide noting ATF 3317 (JWS 3309) for 4AT, Suzuki K‑series transaxle service data listing GL‑4 75W‑90 for manual gearboxes.

For the Splash, transmission fluid does a lot of the heavy lifting. In the 4‑speed auto, the ATF isn’t just a lubricant, it also creates hydraulic pressure to engage clutches and bands, cools the unit, protects against corrosion, and provides the exact friction behaviour the transmission was designed around. In the 5‑speed manual, the gear oil cushions gears and bearings, cools the set, and keeps the brass synchros happy—hence the call for GL‑4 rather than GL‑5 in most Splash manuals.

As part of regular servicing, it’s smart to treat transmission fluid like any other vital fluid. For a 4‑speed auto, many workshops in Australia and New Zealand recommend inspecting condition every service and replacing the ATF around 60,000–80,000 km in harder use (stop‑start, hot climates, towing) or by 100,000–120,000 km/8–10 years at the latest. Always use fluid that meets JWS 3309, don’t mix in Dexron VI, CVT, or “universal” fluids unless they explicitly state JWS 3309 approval. A gentle drain‑and‑fill (possibly repeated) is preferred over a high‑pressure flush on older autos. Check level with the engine idling on level ground after cycling through all gears, aim for the “HOT” mark at operating temperature.

For the 5‑speed manual, fresh GL‑4 75W‑90 every 60,000–90,000 km keeps shifts slick and synchros protected. There’s no dipstick—the correct level is at the bottom edge of the fill port. Use new crush washers, torque the plugs properly, and fill until it just weeps from the hole with the car sitting level.

• Watch for signs it’s due: delayed or harsh shifts, shudder, whining, dark fluid, or a burnt smell.
• Confirm the spec from the build plate/handbook by VIN, as regional specs can vary slightly.

Do that, and the Splash’s gearbox will stay smooth, quiet, and dependable over Aussie and Kiwi kilometres.

Popular questions about 2021 Suzuki Splash transmission fluid

What transmission fluid does a 2021 Suzuki Splash take?

If it’s the 4‑speed automatic, use ATF that meets JWS 3309 (often labelled Toyota T‑IV, Suzuki sells it as ATF 3317). If it’s the 5‑speed manual, use API GL‑4 75W‑90 gear oil. Always confirm against the owner’s handbook or the under‑bonnet label, as regional specs can differ slightly.

How often should the transmission fluid be changed?

For the 4‑speed auto, many local workshops recommend 60,000–80,000 km in severe use, or by 100,000–120,000 km/8–10 years. For the 5‑speed manual, 60,000–90,000 km is a good target. Australian and New Zealand driving—heat, hills, and traffic—often counts as severe service, so err on the earlier side if in doubt.

How do you check the ATF level on a Splash automatic?

Warm the car, park on level ground, set the handbrake, then with the engine idling move the selector slowly through all gears and back to Park. Pull the ATF dipstick, wipe, reinsert, then read the “HOT” range. Healthy ATF is usually red to light amber and shouldn’t smell burnt. For manuals, there’s no dipstick—level is checked at the side fill plug.