How much transmission fluid for Lexus IS250?
For the Lexus IS250 equipped with a six-speed automatic transmission, plan on about 10 quarts of ATF to fill the full system. A pan drain-and-fill typically replaces around 4–6 quarts, while a full transmission flush may require roughly 9–12 quarts, depending on model year and service method. Always use Lexus/Toyota WS ATF and check the level with the engine warm and the car on a level surface.
The IS250, produced roughly from 2006 to 2013, uses a 6-speed automatic transmission. The total capacity and what you actually replace depend on whether you’re performing a simple drain-and-fill or a complete flush, as well as whether a serviceable filter is present. Capacities can vary slightly by year and transmission variant, so the numbers below reflect common practice across the range.
Transmission fluid capacities in practice
Technicians estimate the amount of fluid needed for standard service on the IS250 based on whether a pan drain-and-fill or a full flush is performed. The figures below represent typical ranges used in service guides.
- Total system capacity: about 10–11 quarts (9.5–10.5 liters)
- Drain-and-fill (pan drop) replacement: typically 4–6 quarts
- Full fluid flush (including torque converter and lines): roughly 9–12 quarts
When planning maintenance, budget a little extra for the torque converter and any fluid retained in the cooling circuit. Always use the specified WS ATF and verify the level according to the service manual after completion.
Practical steps for service
Consider these guidelines if you’re performing or scheduling a transmission fluid service on your IS250:
- Use the recommended ATF: Lexus/TOYOTA WS (World Standard) ATF.
- Check the level with the engine warm and the vehicle on a level surface, following the procedure in your manual.
- Decide whether you’ll do a pan drop drain-and-fill or a full flush; purchase the fluid accordingly.
Do not mix ATF types, and ensure the vehicle is on a level surface and at proper operating temperature when checking the level. If unsure, consult a qualified technician or consult your owner's manual for your exact model year.
Summary
For the Lexus IS250, plan for roughly 10 quarts of ATF to fill the system, with 4–6 quarts typically exchanged during a drain-and-fill and 9–12 quarts required for a full flush. Always use the specified WS ATF and follow the service procedures in your manual to ensure correct level and performance.
Model-year notes
The IS250 covers several years with minor transmission variations. Confirm the exact capacity and procedure for your year by consulting the official service manual or your Lexus dealer.
