How much transmission fluid does a 2026 Lexus RX take?

4.2 quarts as a total fill for the P810 transmission (4.2 to 6.8 quarts across this year's engines). A drain-and-refill without removing the pan replaces roughly a third to half of that, so refill to the level check point rather than pouring in the whole figure.

What transmission fluid does a 2026 Lexus RX use?

The source names WS for this year. Use a fluid that states that specification on the bottle.

What brake fluid does a 2026 Lexus RX take?

Check the brake fluid reservoir cap - it states the DOT grade. DOT 3 and DOT 4 can be mixed; DOT 5 silicone fluid cannot.

2026 Lexus RX transmission fluid capacity and fluid specs

GarageDex's fluid data shows the 2026 Lexus RX (2.5L 4-cyl) uses the P810 automatic transmission, which holds 4.2 quarts of fluid as a total fill, specified as WS. Other engines on this year hold 4.2 to 6.8 quarts - see the table.

Shop WS fluid Match the specification on the bottle to your manual

Key takeaways

Transmission: P810 automatic transmission, 4.2 qt total fill, WS fluid.
Total fill is the whole system; a drain-and-refill takes a third to half.
Brake fluid grade: read it off the reservoir cap.
The fluid specification is named by the source - buy a fluid that lists it.

2026 Lexus RX fluids by engine
Engine	Transmission	Total fill	Fluid spec	Brake fluid	Gear oil
2.4L 4-cyl	-	-	per owner's manual	see reservoir cap	rear GL-5 75W-85 0.55 qt transfer case GL-5 0.55 qt
2.5L 4-cyl	P810 automatic	4.2 qt	WS	see reservoir cap	rear 1.8 qt
2.4L 4-cyl	PC60 automatic	6.8 qt	WS	see reservoir cap	-

Fluids for the 2026 Lexus RX

Buy fluid that states the specification your manual names. Multi-vehicle fluids list the specs they meet on the back label - if yours is not listed, it is the wrong bottle.

WS fluidYou need about 5 quarts for a full fillShop fluid DOT 3 or DOT 4 brake fluidA quart covers a full flushShop brake fluid Fluid transfer pumpMost modern transmissions have no dipstick tube - you fill from belowShop pumps

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Other 2026 Lexus RX specs

All specs Engine oil Coolant capacity Maintenance schedule

Other RX years

2025 2024 2023 2022 2021 2020 2019

Source: AMSOIL Auto & Light Truck lookup. Capacities are total system fills; a drain-and-refill takes less. Where no fluid specification is shown, the source lists only a catalog code, so use the specification printed in your owner's manual - the wrong transmission fluid damages a transmission.