The 2009 Acura TL 3.5’s five‑speed automatic transmission requires Honda/Acura ATF DW‑1. Use DW‑1 exclusively, and avoid Dexron-based fluids or older Z1 formulations. This article explains the specification, where it comes from, and how to verify it in your vehicle.
The TL line from this era uses a Honda/Acura automatic transmission that is designed around DW‑1 fluid. This has been the standard for many Acura models starting in the late 2000s, and the 2009 TL 3.5 is expected to follow that specification. Correct fluid ensures smooth shifting, proper lubrication, and longevity of hydraulic components and the torque converter.
What fluid to use
To ensure proper performance and protection, follow the service manual’s guidance for the specific transmission in your TL. The following points summarize the critical guidance you should observe before performing a fluid change or top‑off.
- The recommended fluid is Honda/Acura ATF DW‑1 for the 2009 TL 3.5 with a 5‑speed automatic transmission.
- Avoid Dexron VI, Dexron III, Dexron II, Z1, or other non‑DW‑1 fluids, as they are not approved for this transmission and can affect shifting quality and longevity.
- DW‑1 is formulated to meet Honda/Acura transmission specifications and is designed to be compatible with the TL’s hydraulic circuits and torque converter.
- If you’re unsure whether the fluid currently in the system is DW‑1, verify by checking the owner’s manual, under‑hood label, or consulting a Honda/Acura service advisor.
Using the correct fluid helps maintain smooth shifting, proper line pressure, and overall transmission health. If you’re unsure about the exact specification in your vehicle’s history, it’s best to consult the official manual or a dealer before changing or topping up the fluid.
Additional considerations
Where to verify the specification
When confirming the correct fluid for your TL, start with the owner’s manual. If the manual is unavailable, check the under‑hood information sticker or contact an Acura dealership service department. Service technicians can confirm whether DW‑1 is required for your exact VIN and transmission variant, including SH‑AWD configurations if equipped.
Changing the fluid
If you plan a transmission fluid change, follow the factory procedure or have the service performed by a qualified technician. DW‑1 changes are typically performed with the vehicle at operating temperature, using the correct pan‑drain and refill methods as outlined by Honda/Acura guidelines. After replacement, a transmission fluid level check is recommended to ensure proper fill.
Summary
For the 2009 Acura TL 3.5, the transmission fluid specification is Honda/Acura ATF DW‑1. Use DW‑1 exclusively, avoid Dexron‑based fluids or older Z1 formulations, and verify the specification via the owner's manual or dealer if there’s any doubt. Correct fluid choice supports smooth shifting and transmission longevity, and service guidance should always be followed for changes and checks.