The Best Transmission Fluid

We’re confident that AMSOIL Signature Series Synthetic Automatic Transmission Fluid is the best transmission fluid on the market. But don’t just take our word for it; our products have been tested under a number of real-world applications in severe situations. Keep reading to learn what we discovered about our products after testing.

The ATF Job Description

The transmission of your vehicle is arguably one of its most complex components. The transmissions that exist today are smaller, yet must be built to withstand a higher amount of horsepower and torque. Smooth shifts and longer fluid-life are also major considerations in transmissions.

Modern transmission designs also include a large number of gears, narrow oil passageways and clutch packs. These passageways often require a high amount of fluid in order to function properly. If you’re using your transmission mainly for towing or hauling, there’s a good chance that there will be a lot of torque and heat you’ll have to consider that your transmission will be under. In order for your vehicle to perform optimally, the best transmission fluid must be able to do the following:

  • Resist heat
  • Also work as a hydraulic fluid
  • Deliver the correct amount of friction
  • Protect the gears from wear

Additional Protection After 180,000-Mile Severe Service Testing

It’s tempting to simply say that AMSOIL is better than others at these tasks, but where’s the proof? To prove the Signature Series ATF’s superiority under extreme conditions, it was installed in a Las Vegas taxi fleet and underwent an 180,000-mile severe-service test. These taxis were consistently operated under extreme temperatures and constant starting and stopping with cargo and passengers—all of which have an impact on the fluid. After the 180,000-mile mark, one of the transmissions was selected for analysis.

After 180,000 miles of extreme service, a third-party lab tested the transmission and found more oxidation resistance when using Signature Series Synthetic ATF.

The Aluminum Beaker Oxidation Test (ABOT) is an industry-standard test used to figure out the resistance of a transmission fluid. The ABOT indicated that Signature Series consisted of 83% of its original oxidation inhibitors, which means it stands up exceptionally well to thermal degradation.

Highest FZG Gear Wear Test

So what does reserve protection mean when it comes to the life of your vehicle? A variance in load and speed, like the ones in the Vegas taxis, can lead to serious gear and bearing stress and torque multiplication. AMSOIL created Signature Series Synthetic ATF to have a strong film and anti-wear and high pressure additives that will work together to resist wear under extreme conditions. A test will determine how successful we were.

Oil already used in the 180,000-mile Las Vegas taxi service test was tested with the FZG Gear Wear Test, which measures the ability of a lubrication fluid to prevent scuffing on gear teeth. AMSOIL Signature Series Synthetic ATF passed with flying colors—every one of the dozen stages of cumulative difficulty was no struggle for the oil, with no sacrificing of wear protection between new and used fluid.

Exceptional Friction Durability

AMSOIL Signature Series Synthetic ATF is specially formulated with additives for friction-modification which help the product offer great clutch-holding capability (known as static friction), torque-transfer ability (dynamic friction), and anti-shudder properties (known as slipping torque-converter clutches).

Further analysis shows that post-180,000-mile test, Signature Series Synthetic ATF offered almost the same level of friction protection as unused oil.

Outstanding Cold-Weather Performance

If you are in a cooler environment, startup performance can be a problem. Luckily, the Signature Series Synthetic ATF prevents thickening in cold temperatures, which allows for quick and reliable shifting during cold starts. Its exceptional low-temperature fluidity can also optimize fuel efficiency. Signature Series Synthetic ATF is different from conventional oils because it is wax-free, which helps improve shifting, speed up warm-up times and increase energy efficiency.

Leak Protection Reliability

Specially formulated with seal conditioners, the Signature Series Synthetic ATF is able to prevent gaskets and seals from getting too dried out and cracking, which reduces the potential of fluid leaks.

Extended Drain Intervals for Severe-Service Vehicles

Because Signature Series Synthetic ATF prevents shearing and oxidation, vehicles that operate under severe service that use Signature Series Synthetic ATF can double the recommended drain interval, which saves you money and time.

Easy & Convenient Packaging

Oftentimes, convenience is overlooked when it comes to packaging—but not with AMSOIL’s easy pack flexible packaging design. It can help with easier fills and decrease your waste.

AMSOIL Signature Series is the Best ATF

We’re sure that after rigorous test results, you’ll agree that AMSOIL Signature Series Synthetic Automatic Transmission Fluid is the gold standard of transmission fluids available on the market. AMSOIL provides optimal performance and protection for your transmission.