How much transmission fluid does a IS250 hold?
The IS250’s automatic transmission holds about 9 quarts (roughly 8.5 liters) of ATF when filled to capacity, which is the total system capacity for the typical six-speed automatic used in most IS250 models.
The vehicle’s capacity can vary slightly by model year and transmission variant. If you’re performing a service, understanding whether you’re doing a pan drain and fill or a full flush will determine how much fluid you actually replace; see below for typical service volumes and cautions.
IS250 transmission capacity: what you should know
Below are commonly cited capacities and the amounts you typically replace during standard service options.
- Total system capacity (full fill): about 9 quarts (approximately 8.5 liters).
- Pan-drain-and-refill (partial service): typically 3–4 quarts (approximately 2.8–3.8 liters) replaces, with the rest remaining in the torque converter and cooling lines.
- Full transmission flush (machine-assisted): about 8–9 quarts (roughly 7.6–8.5 liters), depending on the method and whether any fluid remains in the converter.
Conclusion: The IS250’s transmission holds about 9 quarts in total, with practical service volumes depending on the method used to replace the fluid.
Model-year and transmission variations
Some IS250s use slightly different six-speed transmissions depending on market and year. While the overall capacity tends to cluster around 9 quarts, exact replacement amounts can vary by revision; always refer to the service manual for your VIN to confirm the precise figure.
Practical service guidance
When performing maintenance on the IS250’s transmission, follow the manufacturer’s ATF specification and service procedure. Lexus commonly specifies Toyota/Lexus WS-type ATF or Dexron VI-compatible fluids; verify the exact specification for your vehicle. Ensure the engine is at operating temperature during service, check the level after refilling, and avoid overfilling. Use the recommended ATF and monitor the level with the proper dipstick or vehicle procedure.
Summary
In summary, plan for about 9 quarts of transmission fluid for a full-fill on an IS250's six-speed automatic. For a pan drain and refill, expect roughly 3–4 quarts; a full flush will typically require around 8–9 quarts. Capacities can vary by year and transmission variant, so consult the owner's manual or a Lexus dealer to confirm the exact amount for your VIN.
