Using the wrong ATF can lead to harsh shifts, slipping, or long-term damage, so always match the fluid exactly to your owner’s manual.
This guide explains what ATF Type T-IV is, why it matters, and the 5 best Type T-IV transmission fluids available , plus features to help you compare.
ATF Type T IV Transmission Fluid
1. Toyota / Lexus Genuine ATF Type T-IV (OEM)
The official factory fluid for Toyota and Lexus vehicles requiring T-IV. This is the safest, most accurate match to the original specification and is recommended when you want guaranteed compatibility.
Features
- OEM-approved formulation for Toyota and Lexus transmissions
- Meets T-IV / JWS 3309 specifications
- Excellent friction stability for smooth gear changes
- Very good anti-shudder and seal compatibility
- Highly resistant to oxidation and thermal breakdown
- Ideal for full or partial fluid changes
2. Idemitsu ATF Type T-IV / TLS
Idemitsu manufactures transmission fluid for many Japanese automakers. Their T-IV/TLS product is designed specifically to meet Toyota’s requirements and performs exceptionally well in AISIN transmissions.
Features
- Precisely engineered for vehicles calling for Type T-IV
- Smooth shifting and consistent friction stability
- Reduces wear and protects internal components
- Good high-temperature resistance
- Trusted by many Asian vehicle manufacturers
- Available in multiple bottle sizes for easy service planning
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3. Valvoline Import Multi-Vehicle ATF (T-IV Compatible)
Valvoline’s import-focused ATF line includes formulations suitable for Toyota T-IV applications. It’s a premium-quality option for drivers who prefer full-synthetic or synthetic-blend universal ATFs that still meet T-IV specs.
Features
- Designed for many Japanese and European transmissions
- Good compatibility with T-IV systems (verify label)
- Excellent anti-wear and oxidation resistance
- Helps prevent shuddering during gear shifts
- Strong thermal stability under heavy loads
- Widely available and priced competitively
4. Lucas Oil Multi-Vehicle ATF (T-IV Compatible)
Lucas is known for durable, long-lasting fluids. Their multi-vehicle ATF is often used in older import vehicles and works well in transmissions that require T-IV, provided the compatibility is confirmed on the label.
Features
- Smooth gear engagement with strong anti-shudder performance
- High-temperature stability for towing or hot climates
- Rejuvenates seals to reduce leak risks
- Designed for a broad range of import transmissions
- Good for high-mileage vehicles
5. Ravenol ATF T-IV
Ravenol produces a premium, specialty-grade ATF that is directly labeled as ATF T-IV, making it a precise match for Toyota and AISIN requirements. It is especially popular among enthusiasts and European buyers.
Features
- Specifically formulated to meet T-IV and JWS 3309 specs
- High-quality synthetic base oils
- Excellent friction characteristics for precise shifts
- Very strong wear protection for long-term durability
- Low deposit formation and excellent oxidative stability
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What Is ATF Type T-IV?
ATF Type T-IV is a factory-specified automatic transmission fluid for many Toyota and Lexus models produced from the early 2000s to mid-2010s, as well as various Volvo, Saab, and other cars that use AISIN transmissions.
T-IV was engineered to provide:
- Correct friction behavior for smooth, consistent shifts
- Strong anti-shudder performance
- Good oxidation resistance
- Proper viscosity across high and low temperatures
- Seal conditioning to prevent leaks
- Long-term wear protection for clutches and gears
Although newer Toyota models now use WS (World Standard) ATF, millions of vehicles still require Type T-IV and will not perform correctly with any other fluid.
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Buying Tips for ATF Type T-IV
To avoid compatibility issues, keep these points in mind:
1. Follow Your Owner’s Manual
If your manual specifies ATF Type T-IV, do not substitute WS or any other ATF. Use only fluids that clearly state T-IV or JWS 3309 compliance.
2. Be Careful With Multi-Vehicle Fluids
Some universal ATFs meet T-IV specs; others do not. Always check the product’s label or description before purchasing.
3. Buy Enough Fluid for the Job
A simple drain-and-refill typically uses 3–5 quarts. A complete exchange may require 10–12 quarts, depending on the vehicle.
4. Never Mix Incompatible Fluids
Mixing T-IV with WS, Dexron VI, or other formulations may cause harsh shifting or long-term damage.
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FAQs
What is ATF TYPE T-IV?
ATF Type T-IV is a Toyota-specific automatic transmission fluid designed to meet the JWS 3309 specification. It provides the correct friction characteristics, viscosity, and thermal stability needed for many Toyota, Lexus, and AISIN automatic transmissions. Vehicles that require T-IV must use this exact type to maintain smooth shifting and avoid premature transmission wear.
What is the difference between ATF T-IV and WS?
ATF Type T-IV is an older formulation designed for earlier Toyota and Lexus models, while ATF WS (World Standard) is a newer, lower-viscosity fluid used in more modern transmissions. T-IV is thicker and tailored for older AISIN gearbox designs, whereas WS is a fully synthetic, long-life fluid optimized for improved fuel economy and modern transmission tolerances. The two fluids are not interchangeable.
What color is Toyota ATF TYPE T-IV?
Toyota ATF Type T-IV is typically red in color, like most conventional automatic transmission fluids. With age, it can darken to a deeper red or brown, which may indicate oxidation or the need for a fluid change.
What is ATF T4?
ATF T4 is simply another way of referring to ATF Type T-IV (sometimes written as T4, T-4, or T-IV). It is the same specification and meets Toyota’s JWS 3309 requirement for compatible transmissions.
Is Dexron VI compatible with T-IV?
No. Dexron VI is not compatible with Toyota Type T-IV. Dexron VI has different friction characteristics and viscosity, which can cause harsh shifts, slipping, or long-term damage in transmissions designed for T-IV. Always use fluid that specifically meets T-IV / JWS 3309 when required.
What is T04 oil?
T04 oil typically refers to TO-4 transmission and drive train oil, a heavy-duty fluid used in Caterpillar machinery and other industrial equipment. It is completely different from Toyota ATF Type T-IV and is not suitable for automotive automatic transmissions that require T-IV.
Final Thoughts
ATF Type T-IV is a highly specific transmission fluid designed for Toyota, Lexus, and AISIN automatic transmissions. Using the correct Type T-IV fluid ensures:
- Smooth and consistent shifts
- Long transmission life
- Better performance under heat and load
- Protection against clutch wear and slipping
Whether you choose the OEM Toyota T-IV or a trusted aftermarket equivalent such as Idemitsu, Valvoline, Lucas, or Ravenol, make sure the product clearly meets the T-IV/JWS 3309 specification.
