ASRC Transmission Fluid Compatibility Chart(For All Brands)

For vehicles equipped with Aisin ASRC (AS68RC or AS69RC) transmissions, commonly found in Ram trucks and certain heavy-duty applications, the ASRC automatic transmission fluid plays a critical role.

This guide explains what ASRC transmission fluid is, why compatibility matters, and provides a detailed compatibility chart showing equivalent and cross-reference fluids from various brands.

ASRC Transmission Fluid Compatibility Chart

Fluid Name	Manufacturer	Specification / Standard	Compatible Transmissions	Key Features
Mopar ASRC Automatic Transmission Fluid	Mopar	ASRC / AS68RC / AS69RC	Ram 2500, 3500, 4500, 5500 (Aisin)	Genuine OEM fluid, high friction durability, designed for heavy towing and load performance
Aisin ATF-OT4	Aisin	JWS 3309 Equivalent	Aisin AS68RC, AS69RC, AW series	Formulated by the transmission manufacturer; excellent oxidation and thermal resistance
Mobil ATF 3309	Mobil	JWS 3309	Aisin AW / ASRC transmissions	High stability, consistent viscosity across temperatures, proven smooth shifting
Toyota Type T-IV	Toyota	JWS 3309	Toyota, Lexus, and Aisin gearboxes	Compatible with many Aisin transmissions; reliable in both cold and high-heat operation
Valvoline MaxLife Multi-Vehicle ATF	Valvoline	Covers JWS 3309 / ASRC spec	Aisin, Toyota, and select imports	Synthetic base oils, adaptive friction modifiers, compatible with multiple ATF specs
Castrol Transmax Import Multi-Vehicle ATF	Castrol	JWS 3309 / T-IV	Aisin AW, AS68RC, AS69RC	Designed for Asian vehicle transmissions, good clutch engagement stability
Amsoil Signature Series Multi-Vehicle ATF	Amsoil	JWS 3309 compatible	Aisin AW / ASRC	Synthetic formulation, long-life protection, excellent film strength
Ravenol T-IV Fluid	Ravenol	Toyota T-IV / JWS 3309	Aisin AS68RC / AS69RC	German-engineered fluid with high shear stability and low-temperature flow
Red Line D4 ATF	Red Line	JWS 3309 equivalent	Aisin AW, AS68RC	Synthetic ester base, improved wear protection and oxidation control
Liqui Moly Top Tec ATF 1200	Liqui Moly	JWS 3309	Aisin automatic transmissions	Suitable for Aisin-equipped vehicles, smooth shifting and extended service life
Petro-Canada DuraDrive MV Synthetic ATF	Petro-Canada	JWS 3309 / T-IV	Aisin AS68RC / AS69RC	High oxidation resistance and stable viscosity index for long drain intervals
Motul Multi ATF	Motul	JWS 3309 / T-IV	Aisin AW and ASRC	Synthetic technology fluid, compatible with Asian and European transmissions
Pennzoil Multi-Vehicle ATF	Pennzoil	JWS 3309	Aisin AW / AS68RC	Broad compatibility and improved shift quality
Shell M-1375.4 ATF	Shell	JWS 3309 equivalent	Aisin / ASRC	Low-temperature flow and high-temperature oxidation protection

Best ASRC Transmission Fluids

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1. Mobil ATF 3309

Meets JWS 3309 specification used in Aisin AS68RC and AS69RC transmissions.
Delivers consistent shift performance and friction stability.
Excellent thermal and oxidation stability for extended service life.
Provides smooth gear transitions under heavy towing or high-load conditions.
Proven by OEMs and widely used as an ASRC-compatible alternative.

2. Aisin ATF-OT4

Designed by the actual manufacturer of Aisin transmissions.
Specifically formulated to match Aisin clutch materials and hydraulic systems.
Ensures smooth shifting, low-temperature fluidity, and excellent anti-wear protection.
Long-life additive system minimizes varnish and sludge formation.
Suitable for AS68RC, AS69RC, and other Aisin automatic transmissions.

3. Valvoline MaxLife Multi-Vehicle ATF

Full-synthetic ATF formulated for multiple OEM standards, including JWS 3309.
Provides superior heat resistance and film strength under stress.
Enhanced friction modifiers deliver smooth, stable shifts.
Suitable for high-mileage transmissions and mixed fleet applications.
Helps prevent leaks, reduce oxidation, and extend drain intervals.

4. Castrol Transmax Import Multi-Vehicle ATF

Designed for use in most Asian vehicles, including Aisin-built transmissions.
Meets JWS 3309 and Toyota T-IV specifications.
Excellent low-temperature performance ensures cold start protection.
Protects against clutch wear and fluid breakdown at high temperatures.
Trusted brand with consistent quality for import and heavy-duty vehicles.

5. Amsoil Signature Series Multi-Vehicle Synthetic ATF

Fully synthetic ATF engineered for high-performance and long-drain capability.
Meets or exceeds JWS 3309 and ASRC transmission requirements.
Provides outstanding heat and oxidation resistance under severe duty.
Delivers smoother, quicker shifting with improved anti-shudder control.
Ideal for heavy-duty Ram trucks with Aisin transmissions operating in extreme conditions.

Choosing the Right ASRC Compatible Fluid

While many fluids claim compatibility, always check the following before purchasing:

Specification Label – Look for ASRC, JWS 3309, or Toyota T-IV on the label or technical data sheet.
Viscosity Range – Ensure the fluid maintains consistent viscosity at high temperatures to handle towing or heavy loads.
Additive Package – Confirm anti-foaming agents, oxidation inhibitors, and friction modifiers match OEM recommendations.
Vehicle Model – Verify compatibility with your specific Aisin transmission (AS68RC, AS69RC, or AS66RC).

Maintenance Tips for ASRC Transmissions

Change intervals: Replace fluid every 30,000–60,000 miles, depending on usage and load.
Avoid mixing brands: Always drain the old fluid completely when switching brands or formulations.
Check temperature: Maintain proper transmission operating temperature (usually 170°F–200°F).
Inspect filters and seals: Replace transmission filters and pan gaskets during service.
Flush when needed: If the fluid appears burnt or discolored, perform a complete flush with the compatible ATF.

Common Signs of Incorrect or Degraded Fluid

Delayed or rough gear shifts
Slipping between gears
Overheating or burnt fluid smell
The transmission warning light is on the dashboard
Unusual noise during acceleration or deceleration

If you experience these issues after changing fluid, it may indicate an incorrect ATF or contamination from previous fluid types.

What Is ASRC Transmission Fluid?

ASRC transmission fluid is a specialized automatic transmission fluid (ATF) specification created for Aisin Seiki transmissions used in Chrysler, Dodge, and Ram heavy-duty trucks. It ensures precise friction characteristics, heat resistance, and oxidation stability to support heavy towing and long-distance driving.

The OEM product, Mopar ASRC Automatic Transmission Fluid, is uniquely formulated for the Aisin AS68RC and AS69RC transmissions. It provides the right viscosity, shear stability, and clutch-friction modifiers for smooth shifting under load.

Because this specification is highly specialized, not all ATFs can safely replace it. However, several fluids meet or closely match the same performance standards and can be used when the OEM product is unavailable.

Why Compatibility Matters

Using the wrong ATF can lead to:

Harsh or erratic shifting
Slippage during acceleration
Overheating and fluid breakdown
Premature clutch wear or transmission failure

That’s why checking compatibility before switching brands is essential. The ASRC spec is similar to JWS 3309 and Toyota T-IV fluids, meaning certain formulations can serve as suitable alternatives if verified.

Final Thoughts

The ASRC transmission used in Aisin-built units demands high-performance fluid that meets precise friction and thermal characteristics. While Mopar ASRC ATF remains the gold standard, high-quality equivalents such as Mobil ATF 3309, Aisin ATF-OT4, and Valvoline MaxLife ATF can perform well when verified against JWS 3309 or ASRC standards