What kind of transmission fluid does a 2000 Toyota Sienna use?

The 2000 Toyota Sienna’s four-speed automatic transmission is designed to use Dexron II or Dexron III automatic transmission fluid (ATF). Always verify with the owner's manual or the transmission dipstick for your specific vehicle, as production changes or dealer options can affect the requirement.

In more detail, this generation of Sienna commonly uses a four-speed automatic (often the A340E). The ATF specification associated with this transmission is typically Dexron II/III-compatible. While Dexron VI is marketed as compatible with many older Dexron fluids, Toyota’s guidance for this year generally points to Dexron II/III; if you’re considering a newer Dexron variant, consult a Toyota technician or the dealership to confirm compatibility for your VIN.

Recommended transmission fluid types

Here is the standard guidance for the 2000 Sienna’s transmission. Do not substitute fluids unless the manual explicitly allows it.

• Dexron II or Dexron III automatic transmission fluid (ATF) – the conventional specification for the 2000 Sienna's four-speed automatic.

Note: Many brands offer Dexron II/III-compatible ATF; ensure the label indicates compatibility with Dexron II and/or Dexron III, not just a generic “DEXRON.”

Maintenance tips: checking and changing ATF

The following steps outline common procedures for checking the ATF level and performing a drain-and-fill on this transmission. If you’re unsure, consult a professional mechanic to avoid damage.

1. Run the engine until the transmission reaches normal operating temperature (about 180–200°F / 82–93°C).


2. With the engine running and the transmission in Park, pull the ATF dipstick, wipe, reinsert, and pull again to check the level. The fluid should be within the hot range on the dipstick when warm.


3. To change the ATF, place a drain pan under the transmission pan, loosen the drain plug if equipped, let the fluid drain, and then replace the drain plug. If applicable, replace the transmission filter and pan gasket.


4. Refill through the dipstick tube with the correct Dexron II/III ATF until the level reaches the hot mark. Recheck and adjust if needed.


5. Take a short test drive to circulate the new ATF, then recheck the level and top off if necessary.

Important: Do not mix different ATF types. If you’ve already mixed fluids, consult a technician before running the transmission again.

Common questions and clarifications

If your vehicle’s VIN or service history lists a different specification (due to a regional bulletin or dealer option), follow that guidance. In some cases, Dexron VI may be considered an acceptable replacement, but only after confirming compatibility for your specific unit.

Summary: For a 2000 Toyota Sienna, the recommended ATF is Dexron II/III-compatible automatic transmission fluid. Always verify with the owner’s manual or a Toyota dealer for your exact VIN, and perform maintenance with the correct fluid to protect shifting performance and transmission life.

What kind of transmission fluid does a 2000 Toyota Sienna take?

The 2000 Toyota Sienna typically requires Toyota Genuine ATF Type T-IV or a fluid that is approved to meet Toyota's specifications for this older model. While some sources suggest that DEXRON-III or DEXRON-VI fluids may be compatible, using the correct Type T-IV is the safest and most reliable option to prevent transmission damage. 
Recommended fluid

• Toyota Genuine ATF Type T-IV: This is the manufacturer-recommended fluid for many older Toyota transmissions, including the 2000 Sienna.
• Synthetic T-IV: Synthetic versions that meet Toyota's specifications can also be used. 

Why using the correct fluid is important

• Shift shocks and poor performance: Using an incorrect fluid can lead to rough shifting, reduced acceleration, and decreased torque.
• Damage: Incompatible fluids can reduce clutch life and ultimately damage the transmission.
• Mixing fluids: Avoid mixing different types of transmission fluid, as this can disrupt the proper hydraulic function and lubrication. 

What kind of transmission fluid does a Toyota Sienna take?

The transmission fluid type for a Toyota Sienna depends on the model year, but commonly used fluids are Toyota Genuine ATF WS (World Standard) for newer models (like 2009 and 2015) and ATF T-IV (Type 4) for some older models. Newer models (around 2005-2013) may use Dexron VI. Always check your owner's manual to confirm the specific type for your vehicle's year to ensure correct fluid and avoid damage.
 
Fluid types by model year (general guidance)

• ATF T-IV: Often required for some older automatic transmissions, but do not use if your manual specifies WS or Dexron. 
• Toyota Genuine ATF WS: Typically recommended for models like the 2009 Sienna and 2015 Sienna. 
• Dexron VI: Often specified for models in the mid-2000s to early 2010s, such as 2005, 2007, 2010, and 2013 Siennas. 
• JWS 3324 or NWS9638: An alternative specification that may be used for models like the 2015 Sienna. 

Important considerations

• Consult your owner's manual: This is the most reliable source for the correct transmission fluid type for your specific vehicle year and model. 
• Use the correct fluid: Using the wrong fluid can cause shifting problems and damage the transmission. 
• Check fluid level and condition: Regularly check the transmission fluid level with the dipstick when the engine is warm and running. Low or dirty fluid can lead to slipping or overheating. 

What kind of transmission fluid does a 1999 Toyota Sienna take?

The correct automatic transmission fluid for a 1999 Toyota Sienna is Dexron III. While Dexron VI is a newer, more efficient fluid, Dexron III is specifically recommended for this model year and is generally more compatible with the transmission's seals. You should always check your vehicle's owner's manual to confirm the correct fluid type.
 

• Fluid type: Dexron III (DEX/MERC).
• Why it's recommended: It is compatible with the seals and components of the 1999 Sienna's transmission.
• Alternative: Some multi-vehicle fluids that list Dexron III as a compatible type can be used, but always verify before purchasing.
• Why not Dexron VI: While Dexron VI is a modern fluid and may be suitable for newer vehicles, it was not available when the 1999 Sienna was manufactured and may not be compatible with the transmission's older seals.
• Final check: Always consult your owner's manual for the most accurate information on your specific vehicle.

What ATF does Toyota recommend?

ATF T-IV ( Type 4 Automatic Transmission Fluid) for all automatic transmissions which require ATF T, T2, T3 or T4. Do not use this fluid if your manual states your transmission uses Dexron or ATF WS! Designed, tested and approved by Toyota R&D. Special additives protect against corrosion and excessive wear.