AMSOIL SIGNATURE SERIES ULV 100% SYNTHETIC AUTOMATIC TRANSMISSION FLUID

AMSOIL Signature Series ULV 100% Synthetic Automatic Transmission Fluid delivers premium protection for vehicles equipped with transmissions requiring ultra-low viscosity fluid, including late-model Ford and GM trucks, SUVs, and cars spec'd for MERCON ULV or DEXRON ULV. It handles severe-service heat, maintains clean internals, and lets you confidently double the manufacturer's severe-service drain interval.

Modern automatic transmissions are engineered with tighter tolerances, more gears, and narrower oil passages than ever before. These designs demand thinner, more precise fluids that still protect under the brutal combination of heavy towing, stop-and-go traffic, and elevated temperatures. Using a fluid that can't handle the thermal load leads to oxidation, sludge buildup in the valve body, and glazed clutch packs, all of which translate to rough shifts, torque converter shudder, and shortened transmission life.

WITHSTANDS SEVERE-SERVICE HEAT FOR 180,000 MILES
Heat kills transmission fluid. Every 20-degree increase in operating temperature roughly doubles the rate of oxidation, and towing a trailer through summer traffic can push fluid temperatures well beyond factory assumptions. AMSOIL Signature Series Synthetic ATF was put through a 180,000-mile taxi fleet field trial in Las Vegas, one of the most punishing environments for an automatic transmission. After that mileage in severe service, the fluid still contained 83 percent of its original oxidation inhibitors. The valve body was virtually sludge-free, and clutch plates earned a "good" rating, the highest possible score for deterioration and wear. That kind of thermal resilience directly applies to the ULV formulation, which shares the same Signature Series additive philosophy.

PREVENTS SLUDGE AND DEPOSIT FORMATION IN NARROW OIL PASSAGES
Ultra-low viscosity transmissions like the Ford 10R80 and GM 10L80/10L90 rely on extremely narrow oil passages and tight solenoid tolerances. Sludge or varnish in those passages disrupts shift timing, causes delayed engagements, and can trigger transmission fault codes. Signature Series ULV is formulated with high concentrations of antioxidants that resist breakdown and keep internal components clean. The Aluminum Beaker Oxidation Test (ABOT) performed by an independent lab after the 180,000-mile trial confirmed that the Signature Series formulation outlasted the oxidation resistance required of new Chrysler ATF+4 fluid, even after severe-service use.

OUTSTANDING WEAR PROTECTION UNDER HIGH TORQUE LOADS
Transmission gears and bearings endure enormous stress, especially in trucks like the Ford F-150 with the 10R80 or the Chevrolet Silverado 1500 with the 10L80. Varying speeds and loads create torque multiplication that punishes internal components. In the industry-standard FZG Gear Wear Test, the Signature Series Multi-Vehicle formulation achieved a "Pass" at stage 12, the highest stage, after 180,000 severe-service miles. That result exceeded the Ford MERCON V and Chrysler ATF+4 specifications for new fluid. Premium anti-wear and extreme-pressure additives maintain a strong protective film even as the fluid ages.

SMOOTH SHIFTS AND ANTI-SHUDDER PERFORMANCE
Torque converter shudder is one of the most common complaints from owners of late-model GM and Ford trucks. It typically stems from degraded friction modifier additives that can no longer maintain proper clutch engagement characteristics. Signature Series Synthetic ATF is formulated with friction modifiers that deliver strong clutch-holding capacity (static friction), reliable torque transfer (dynamic friction), and effective anti-shudder properties for slipping torque converter clutches. After 180,000 miles in severe service, the Signature Series formulation provided nearly identical friction properties compared to new fluid.

COLD-TEMPERATURE FLUIDITY
Cold, thick ATF lengthens shift times and reduces fuel economy during warm-up. The ULV formulation delivers a Brookfield viscosity of just 4,050 cP at -40°C (ASTM D2983), significantly lower than the Multi-Vehicle ATF (9,755 cP) and Fuel-Efficient ATF (7,677 cP) at the same temperature. That translates to faster shift response and improved energy efficiency during cold starts, which matters in northern climates where transmissions can sit overnight at well below zero. The wax-free synthetic base stocks maintain extraordinary cold-flow properties without sacrificing high-temperature protection.

SPECIFICATIONS AND COMPATIBILITY
AMSOIL Signature Series ULV Synthetic ATF is designed for transmissions and other applications requiring Ford MERCON ULV or GM DEXRON ULV specifications. This covers a wide range of late-model vehicles, including Ford F-150, Ford Explorer, Ford Mustang, Chevrolet Silverado 1500, GMC Sierra, Chevrolet Traverse, and Cadillac CT5 equipped with 10-speed and other modern automatic transmissions.

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 U.S. and Canada, change at the vehicle manufacturer's recommended drain interval.