AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid

Product overview

Newer automatics run thinner fluid to cut internal drag and gain fuel economy, and they are unforgiving about viscosity. Signature Series Fuel-Efficient ATF is the low-viscosity Signature Series formula for the transmissions built around those specifications.

It stays fluid in deep cold, with a pour point of -65°C, so the first shifts on a winter morning are not waiting on thick oil. It is also backward compatible in older GM automatics that called for DEXRON III.

Matching the transmission's low-viscosity requirement

The phrase fuel-efficient does not settle fitment on its own. Signature Series Fuel-Efficient ATF is listed for transmissions calling for requirements including Aisin-Warner AW-1, Ford MERCON LV and MERCON SP, GM DEXRON VI and DEXRON HP, Honda and Acura DW-1 along with Type 2.0, Type 3.0, and Type 3.1, Chrysler MOPAR SP-IV, and the Hyundai and Kia SP-IV family, with further entries covering Aston Martin, Bentley, BMW, Iveco, and Jaguar.

A transmission that calls for a conventional multi-vehicle grade takes a different fill. This fluid measures 6.3 cSt at 100°C against 7.5 cSt for the conventional Signature Series grade, and the two are matched to separate requirement lists rather than to driver preference. Confirm the requirement published for the transmission, then check it against the list on this page.

Cold starts, warm-up, and shift response

Cold, thick automatic transmission fluid lengthens shift times, which is why cold-flow behavior matters as much as the headline viscosity number in a low-viscosity application. Signature Series Fuel-Efficient ATF has a pour point of -65°C (-85°F), a Brookfield viscosity of 7,676 cP at -40°C, and a viscosity index of 159.

Those cold-flow properties support quicker shift response, shorter warm-up times, and better energy efficiency, which is the combination the specification is written around. The first shifts on a winter morning are not waiting on fluid that has gone stiff in the pan.

Heat resistance in the Signature Series additive system

High concentrations of antioxidants make the Signature Series formulation naturally heat resistant. Deposits are the reason that matters: sludge and varnish restrict narrow oil passages and contribute to clutch glazing, and a low-viscosity fluid spends its working life in exactly those passages.

Oxidation resistance for the line was measured on the conventional grade rather than on this one. An independent third-party lab ran the Aluminum Beaker Oxidation Test, an industry-standardized measure of how long a transmission fluid resists oxidation, on Signature Series Multi-Vehicle Synthetic ATF pulled after 180,000 severe-service miles. The used fluid resisted oxidation longer than new fluid must in order to meet the Chrysler ATF requirement.

Where this fluid crosses over, and where it does not

The formula is backward compatible in older GM automatic transmissions that called for DEXRON III, because the DEXRON VI requirement supersedes the obsolete DEXRON III. The substitution runs one way only, since an obsolete fluid is not a stand-in inside a transmission designed around the newer requirement.

Toyota coverage is narrower than it first appears. The fluid is suitable where a Toyota CVT calls for the WS specification, and that is the continuously variable application named for it, so a CVT that specifies a dedicated CVT fluid takes AMSOIL Synthetic CVT Fluid instead. Owners on a factory drain schedule rather than an extended one can compare OE Fuel-Efficient ATF, the lower-viscosity grade in the OE line.

Specifications Signature Series Fuel-Efficient ATF covers

This fluid covers transmissions and other applications that require any of the following:

• Aisin-Warner AW-1
• Aston Martin FD33-19A509-AA
• Bentley JNV 862 564 D
• BMW 83 22 0 142 516, 83 22 2 152 426, ATF 3+, 83 22 5 A12 A00
• Chrysler MOPAR 68157995AA, SP-IV, 68218925AB
• DSIH 6p805
• Ford MERCON LV, SP
• GM DEXRON HP, DEXRON VI
• Honda/Acura DW-1, Type 2.0, Type 3.0, Type 3.1
• Hyundai/Kia SP-IV, SPH-IV, SP-IV-RR, NWS-9638, P4-M, SP-IV-M1
• Iveco 5000 42 124
• Jaguar 02JE 2644

Coverage as published in the AMSOIL data bulletin, checked July 2026. AMSOIL revises coverage when a formula changes, so confirm against AMSOIL's current data bulletin before ordering. The published list continues past the entries shown here, so open the data bulletin for the complete version.

Service life

Normal service: follow the vehicle manufacturer's normal-service drain interval.

Severe service: double the vehicle manufacturer's severe-service drain interval in passenger cars and light trucks.

Outside the United States and Canada, change at the vehicle manufacturer's recommended drain interval.

Good to know

• The formula is backward compatible and replaces DEXRON III fluids in older GM automatic transmissions, since the DEXRON VI specification supersedes the obsolete DEXRON III.
• It is also suitable for Toyota CVT applications calling for the Toyota WS specification.

Typical technical properties

Typical properties published by AMSOIL, checked July 2026. These are representative values rather than a specification, and they change when AMSOIL updates a formula.

Package sizes and product codes

Select a product code to open that package size on the AMSOIL product page.

Product documents

AMSOIL publishes the full technical detail for this product in these documents.

• Signature Series Fuel-Efficient ATF product data bulletin (PDF)
• Signature Series Fuel-Efficient ATF safety data sheet (PDF)

Where to order

Confirm this formula is the match for the vehicle or equipment in the AMSOIL product guides, then order Signature Series Fuel-Efficient ATF online. Existing members can sign in to apply the discount automatically.

Details and questions