Hold On to Your Power

Today’s engines provide more horsepower and torque than ever, delivering impressive towing capability, quick acceleration and the confidence to handle demanding workloads. But that performance isn’t guaranteed to last. Over time, internal wear, deposits and sludge can quietly chip away at engine efficiency, reducing the power you rely on every day. Protecting your engine’s horsepower and torque is a key reason to choose your motor oil wisely. By maintaining internal cleanliness and reducing component wear, motor oil plays a direct role in preserving the power and responsiveness you expect. AMSOIL Signature Series 100% Synthetic Motor Oil is engineered to protect horsepower and torque, helping your engine deliver consistent performance mile after mile.

Hidden Power Thieves

Horsepower and torque don’t simply disappear overnight; they are gradually reduced by the natural byproducts of engine operation. Over time, engine wear, deposits and sludge can work together to rob performance.

As an engine accumulates miles, wear on critical components like piston rings, cylinder walls and valvetrain parts starts to take a toll. These parts are essential for maintaining proper compression and sealing inside the combustion chamber. Even slight losses in sealing efficiency can lead to measurable drops in power output, reducing the engine’s ability to generate force.

At the same time, carbon deposits build up on pistons, intake valves and within combustion chambers. These deposits interfere with airflow and disrupt proper fuel atomization, both of which are essential for efficient combustion. When combustion efficiency declines, so does the engine’s ability to produce maximum horsepower and torque.

When present, sludge formation further compounds the problem. Often the result of oxidation and contamination of the oil, sludge can restrict oil flow and limit lubrication to vital engine components, accelerating wear and increasing friction and heat.

The result is an engine that no longer performs at its peak, delivering reduced throttle response, diminished pulling power and decreased overall efficiency.

Engineered to Defend Performance

Signature Series 100% Synthetic Motor Oil is engineered to protect engine performance. Premium synthetic base oils provide exceptional resistance to breakdown under high heat, helping maintain viscosity and film strength even in extreme conditions. Exceptional oxidation resistance helps prevent sludge formation, ensuring oil passages remain clean. Advanced additive systems actively combat deposit formation by keeping contaminants suspended and preventing buildup on engine surfaces. A durable protective barrier between moving parts effectively reduces metal-to-metal contact and preserves critical tolerances. Together, these features help engines maintain efficiency and internal cleanliness, two essential factors in preserving horsepower and torque over time.

Proven Performance Retention

AMSOIL Signature Series 100% Synthetic Motor Oil is built to help engines run stronger, longer¹ — helping protect engines from performance loss throughout their lives. To evaluate horsepower and torque retention, Signature Series 5W-30 100% Synthetic Motor Oil (ASL) was installed in a 2025 Ford* F-150 Raptor* and run through a 125,000-mile (201,168-km) test. Oil changes were performed at 25,000-mile (40,234-km) intervals, and power sweeps were performed before and after the 125,000-mile test protocol.

As the results show, Signature Series maintained horsepower and torque throughout the entire 125,000-mile test, even under the elevated stresses of a high-output 3.5L engine.

Engine protection goes far beyond avoiding catastrophic failure. Protecting your engine’s horsepower and torque is a critical job for motor oil. AMSOIL Signature Series 100% Synthetic Motor Oil is engineered to address the specific factors that quietly erode power over time, helping engines maintain the strength, responsiveness and capability they were built to deliver so you can hold on to the power you count on every day.

¹Using Signature Series 100% Synthetic 5W-30 Motor Oil in a 2025 Ford F-150 Raptor in a 125K-mile accumulation study. Based on comparative start- and end-of-test horsepower and torque.