How much transmission fluid does a gs300 take?
The Lexus GS300's automatic transmission typically holds about 11 quarts (roughly 10.5 liters) of ATF when you perform a full change. A pan-drop-and-fill swaps out about 3–5 quarts, while a complete fluid flush can move about 9–11 quarts through the system. Always verify the exact figure for your year and transmission type in the owner's manual or service bulletin.
Context and what affects capacity
Capacity numbers vary by year, market, and whether you’re performing a pan drain, a complete flush, or a full replacement including the torque converter. The figures below describe the typical GS300 setup with the common four-speed automatic used across many model years.
Typical capacity ranges
The following figures are common references for the GS300 with the 4-speed automatic. They shed light on what you can expect from different service approaches:
- Full system capacity: about 11–12 quarts (10.4–11.4 liters).
- Pan drain and fill: typically about 3–5 quarts (2.8–4.7 liters) removed and replaced.
- Full flush (fluid exchange through the system, including the torque converter): about 9–11 quarts (8.5–10.4 liters).
Understanding these numbers helps you budget the right amount of ATF and avoid over- or under-filling after a service.
Year and transmission variations
Not every GS300 uses the exact same transmission or ATF specification. The model line has spanned years and markets, and some variants used older Dexron-type fluids while later models align with Toyota/Lexus recommendations. Always consult the owner’s manual or a current service bulletin for your vehicle’s exact year, market, and transmission reference to confirm both capacity and fluid type.
ATF type recommendations
Fluid compatibility matters as much as capacity. Use the ATF specified by Lexus for your year and transmission. If in doubt, start with a standard equivalent that meets the OEM spec and recheck the level after the vehicle has reached operating temperature and been run through a short drive.
How to perform a fluid change safely
Before you begin, note that the following steps are a guide for a basic pan drain and fill. For a complete flush or a full replacement including the torque converter, service with compatible equipment or have a professional perform the procedure.
- Warm the engine and transmission by driving briefly to bring ATF to operating temperature.
- Secure the car on level ground and safely raise with jack stands if you’re working under it.
- Place a drain pan under the transmission, then remove the pan bolts and drain the ATF completely.
- Remove and inspect the transmission pan; replace the gasket and reinstall the pan.
- Replace the filter if your kit includes one and it's accessible from the pan area.
- Pour in the recommended ATF gradually, usually 3–5 quarts to start, then check the level with the dipstick while the transmission is warm and in Park or Neutral as specified by the manual.
- Take a short drive to circulate the new fluid, then recheck level and top up as needed to bring it to the correct mark.
Following these steps will help ensure the transmission is correctly filled and leveled. Always verify the level with the dipstick while the fluid is at the proper operating temperature.
Summary
In summary, a typical GS300 automatic transmission holds about 11–12 quarts of ATF, with pan-only drains replacing roughly 3–5 quarts. A full flush can exchange about 9–11 quarts. Always confirm the exact capacity and ATF specification for your year and market, and follow the recommended procedure or seek professional service if unsure.
