AMSOIL Formula 4-Stroke 0W-40

AMSOIL DOMINATOR DOT 4 100% Synthetic Racing Brake Fluid

AMSOIL DOMINATOR DOT 4 100% Synthetic Racing Brake Fluid is built for drivers and riders who push brakes to the limit.
Track days, time attack, autocross, road racing and aggressive canyon runs all create brutal heat in the brake system.

When temperatures spike, ordinary brake fluids can boil, compress and fade.
DOMINATOR DOT 4 is engineered to keep the pedal firm and responsive when you need it most.

Firm Pedal Feel Under Extreme Heat

Why Brake Fluid Boiling Is So Dangerous

Hard braking turns kinetic energy into heat at the rotors and pads.
That heat quickly transfers into the calipers and the brake fluid.

If the fluid reaches its boiling point, it can form vapor bubbles.
Vapor compresses far more than liquid, so when you press the pedal, it feels:

• Soft or “spongy”
• Longer in travel
• Sometimes almost dead, known as vapor lock

Water contamination makes this worse.
Brake fluid is hygroscopic, meaning it absorbs moisture over time.
Even a few percent water can drag the boiling point down and cause fade much earlier.

Ultra-High Dry And Wet Boiling Points

DOMINATOR DOT 4 is built specifically to fight this problem.
It features ultra-high boiling points of about 580°F (dry) and 410°F (wet), far above basic DOT 4 minimums.

That matters because:

• Dry boiling point is the temperature of fresh, unused fluid.
• Wet boiling point is measured after the fluid has absorbed about 3.7% water, simulating real-world use.

Higher dry and wet boiling points mean DOMINATOR keeps working long after ordinary DOT 3 or standard DOT 4 fluids have started to fade.

Low Compressibility For A Consistent Pedal

Even before fluid actually boils, some brake fluids can compress slightly under very high pressure.
DOMINATOR DOT 4 is formulated to maintain low compressibility even under extreme race conditions.

The benefit is simple:

• More direct pedal feel
• Easier modulation at the limit
• Better confidence trail-braking into corners

Unique Chemistry For Serious Drivers And Racers

Beyond Minimum DOT Standards

DOT 4 is already a performance step up from DOT 3, with higher required boiling points.

DOMINATOR DOT 4 pushes even further by:

• Exceeding standard DOT 4 wet and dry boiling point specs
• Maintaining viscosity stability over a wide temperature range
• Flowing easily at the very high line pressures generated by modern performance braking systems

That means you get a fluid designed for motorsports, not just daily commuting.

Nitrogen Blanketing To Fight Moisture

During manufacturing, a nitrogen blanket is added to each bottle.
This process helps purge moisture from the container headspace and protects the fluid before you ever crack the seal.

Why it matters:

• Brake fluid is naturally hygroscopic
• Moisture is the enemy of high boiling points and corrosion resistance
• Reducing exposure before the bottle is opened helps preserve performance

Once opened, you should treat DOMINATOR like any race fluid:
keep it sealed tightly and avoid using old, half-empty bottles for critical track events.

Stable Viscosity Across Extreme Temperatures

Modern ABS and traction-control systems cycle valves incredibly fast.
To work properly, the brake fluid needs predictable viscosity in both cold and hot conditions.

DOMINATOR DOT 4 is formulated to:

• Maintain a stable viscosity across a wide temperature range
• Flow reliably in cold starts
• Still handle extreme race heat without thinning excessively

That balance supports consistent ABS and stability control behavior under hard braking.

Who Should Use AMSOIL DOMINATOR DOT 4

Track-Day Drivers And Time Attack Competitors

If you run:

• HPDE events
• Track days
• Time attack or time trials
• Club racing

you know brake performance is non-negotiable.

DOMINATOR DOT 4 gives you:

• Higher resistance to fade on long sessions
• More confidence charging into heavy braking zones
• A safety margin when rotors and pads are glowing hot

It’s especially helpful on:

• Heavy performance cars
• Vehicles on sticky tires
• Tracks with repeated high-speed braking zones

Autocross, Drift And Performance Street Use

Even short autocross runs produce very high localized temperatures at the calipers.
Drift cars see repeated, aggressive braking to set up slides.

Using DOMINATOR DOT 4 helps:

• Reduce the chance of pedal drop-off late in a run
• Maintain feel as brakes cycle between hard use and cooldown
• Protect components over a busy season of events

Powersports And Motorsports Applications

DOMINATOR DOT 4 can also be used in racing applications that specify DOT 4 fluid, including:

• Track-prepped motorcycles
• Performance UTVs and side-by-sides with upgraded brakes
• Rally and off-road race vehicles

Always confirm system compatibility and follow the manufacturer’s recommendations.

Service Intervals And Best Practices

How Often To Change DOMINATOR DOT 4

Operating conditions play a big role in fluid life.
High temperatures, heavy braking and moisture exposure all shorten service intervals.

For racing and track applications, AMSOIL recommends changing DOMINATOR DOT 4 about once per year for maximum performance.

If you run many events or see severe conditions (long mountain descents, repeated track days), more frequent changes may be smart.

Signs It’s Time To Flush Your Brake Fluid

Watch for:

• Spongy or soft brake pedal feel
• Pedal that gradually sinks further during a session
• Noticeable fade after repeated hard stops
• Fluid that looks dark or contaminated in the reservoir

These signs can indicate moisture, heat damage or contamination.
A full flush with fresh DOMINATOR DOT 4 is a relatively low-cost way to restore confidence.

General Bleeding Tips

For best results:

• Use a clean, dedicated brake-fluid bottle and tools
• Don’t allow the reservoir to run dry during bleeding
• Bleed in the correct order for your vehicle (often the farthest caliper first)
• Avoid spilling fluid on painted surfaces

Once finished, dispose of old fluid properly.
Brake fluid is hazardous waste and should never be poured down drains or onto the ground.

DOMINATOR DOT 4 Versus Standard Brake Fluids

Compared To Typical DOT 3

DOT 3 fluids have lower minimum boiling points.
With even modest moisture content, they can fall below safe levels for serious performance driving.

DOMINATOR DOT 4 offers:

• Much higher dry and wet boiling points
• Better protection against fade and vapor lock under racing heat
• More margin of safety as the fluid slowly absorbs moisture in use

Compared To Basic DOT 4

Standard DOT 4 is better than DOT 3, but still aimed mainly at everyday driving.

DOMINATOR DOT 4 focuses on:

• Ultra-high dry and wet boiling points
• Low compressibility under extreme pressure
• Track-proven performance, backed by real racers and reviews

If your vehicle is mostly street-driven with only gentle use, a standard brake fluid may be enough.
If you routinely push the brakes hard, DOMINATOR is the step up built for that job.

Why Serious Drivers Choose AMSOIL DOMINATOR DOT 4

Confidence When It Matters Most

When you are:

• Diving into a brake zone at triple-digit speeds
• Trail-braking deep into a corner
• Running long sessions at a lapping day

you do not want to wonder what your brake fluid is doing.

DOMINATOR DOT 4 is engineered to:

• Keep the pedal firm and responsive
• Resist fade and vapor lock under extreme conditions
• Deliver consistent braking lap after lap

Part Of A Complete Performance Package

Brake fluid is often the most overlooked performance upgrade.

When you pair DOMINATOR DOT 4 with:

• Quality pads and rotors
• Stainless braided lines
• Proper cooling and ducting where needed

you can transform the overall feel and reliability of your braking system.

For drivers and racers who treat brakes as a core performance system,
AMSOIL DOMINATOR DOT 4 100% Synthetic Racing Brake Fluid is a powerful way to add safety, control and confidence every time you step on the pedal.