What transmission fluid does a 2009 Acura TSX take?
The 2009 Acura TSX uses different fluids depending on the transmission: DW-1 automatic transmission fluid for the automatic, and Honda MTF (or an equivalent GL-4 75W-90 gear oil) for the manual. This simple distinction is important for performance and longevity.
In this article, we break down the transmission options in the 2009 TSX, specify the official fluids for each, and offer practical notes on maintenance and compatibility. The TSX was offered with two transmissions of that year—an automatic and a manual—and each requires its own fluid type.
Two transmissions available in the 2009 TSX
The 2009 TSX was offered with a 5-speed automatic transmission or a 6-speed manual transmission. The fluid you use depends on which one your car has.
Automatic transmission
What fluid to use in the automatic transmission
The following fluid specification applies to the automatic transmission as outlined by Honda/Acura.
- Honda ATF DW-1 (Honda/Acura automatic transmission fluid DW-1)
Use DW-1 ATF as specified by the manufacturer to maintain shifting quality and transmission life. Substituting other ATFs can cause shifting issues and potential damage.
Manual transmission
What fluid to use in the manual transmission
The manual transmission requires gear oil that meets Honda/Acura MTF standards, or a widely accepted GL-4 75W-90 equivalent, if MTF is unavailable.
- Honda Manual Transmission Fluid (MTF)
- Equivalent GL-4 75W-90 gear oil
Using the OEM MTF is recommended for peak performance, but a high-quality GL-4 75W-90 option is an acceptable replacement if you confirm compatibility with your vehicle's manual.
Maintenance notes and tips
Always use the correct fluid type for your specific transmission, do not mix fluids between different systems, and consult the owner's manual or a dealer for the exact fill capacity and service interval. If you're unsure, have a professional perform the change.
Summary
Summary: For a 2009 Acura TSX, automatic transmissions require Honda ATF DW-1; manual transmissions require Honda MTF or an equivalent GL-4 75W-90 gear oil. Check your owner's manual for the exact capacity and service interval, and when in doubt, consult a qualified technician or Acura dealer.
What type of transmission fluid does Acura use?
ATF TYPE 2.0
ATF-DW1 - Automatic Transmission Acuras (Non CVT Trans.) ATF TYPE 2.0 - 10 speed Acura Transmission vehicles.
What happens if you use ATF instead of CVT fluid?
Putting automatic transmission fluid (ATF) in a continuously variable transmission (CVT) can cause serious damage, including slipping, excessive wear, poor performance, and eventual failure. This is because CVT fluid has specific friction-modifying properties crucial for the belt and pulleys to grip properly, while ATF has different characteristics and can cause the belt to slip. If you mistakenly use ATF, you should immediately have the transmission professionally flushed and refilled with the correct CVT fluid to prevent long-term damage.
This video explains what happens when you put ATF in a CVT transmission: 40sCounty Office LawYouTube · Oct 26, 2024
Why this is a problem
- Wrong friction: CVT fluid is engineered with specific friction modifiers to ensure the belt grips the pulleys. ATF contains different additives that reduce friction, causing the belt to slip.
- Slipping and wear: This slipping leads to inefficient power transfer, poor performance, and significant wear on the transmission's internal components.
- Incorrect viscosity: CVT fluid is formulated to maintain a consistent viscosity across a wider temperature range than ATF, which is essential for the continuous operation of the transmission.
- Damage progression: You may not notice the damage immediately, but the transmission will degrade over time, potentially leading to a complete failure.
What to do if this happens
- Stop driving immediately: Do not continue to drive the vehicle, as this will worsen the damage.
- Get a professional flush: A complete transmission flush is necessary to remove all traces of the incorrect fluid.
- Refill with the correct fluid: After the flush, refill the transmission with the exact CVT fluid specified by the manufacturer.
- Consider a professional check: A qualified mechanic should inspect the transmission to assess for any existing damage.
This video explains what to do if you put ATF in a CVT transmission: 51sKDF channelYouTube · Sep 7, 2022
How much transmission fluid does a Acura TSX take?
A Acura TSX transmission flush also uses about 10 quarts of fluid to completely clean and flush out the system.
What kind of transmission fluid does a 2009 Acura TSX take?
STP Mercon V Automatic Transmission Fluid 1 Quart.
