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How To

Seasonal Maintenance Guide: Spring, Summer, Fall and Winter

Spring, summer, fall and winter maintenance for your car or truck, bike and outdoor equipment, all in one place.

October 1, 2026

How To

Transmission Fluid and Gear Oil: The Complete Guide

How automatic, manual, CVT and dual-clutch transmissions and differentials work, what fluid they need and when to change it.

October 1, 2026

News

Sportsman Spotlight: The Racers and Riders Who Run AMSOIL

Meet the racers, riders and outdoor enthusiasts who partner with AMSOIL, and find out why they trust AMSOIL synthetic lubricants.

October 1, 2026

Editor’s Picks

News

Turn More Heads with AMSOIL Car Care

AMSOIL car-care products are engineered with advanced technology to deliver powerful cleaning action that helps vehicles shine brighter.

News

Your Ultimate Oil Change

Right product. Right package. Right to your door.

News

Which AMSOIL Motor Oil Is Right for You? A Comparison

No matter what you drive or how you drive, AMSOIL provides specially formulated motor oil designed to protect your vehicle.

9 Motor Oil and Car Maintenance Myths, Busted

Motor oil myths abound. Here are nine of the most persistent along with our myth-busting facts.

Synthetic vs. Conventional Oil: The Differences That Matter

Find out everything you need to know about synthetic vs. conventional motor oil.

5W-20 vs 5W-30 vs 10W-30: What’s the Difference?

The primary differences are their viscosities when cold and once your engine has reached operating temperature.

Transmission Flush vs Fluid Change: Which is Better?

Is a flush or pan drop better when changing transmission fluid? Learn the pros and cons of each method.

How To

How to Check Power Steering Fluid (and When to Change it)

There are a couple ways to change power steering fluid, depending on your technical know-how.

How to Clean Fuel Injectors: Gas and Diesel

Using proven AMSOIL fuel additives can save you money on expensive maintenance.

Featured

News

Turn More Heads with AMSOIL Car Care

AMSOIL car-care products are engineered with advanced technology to deliver powerful cleaning action that helps vehicles shine brighter.

June 3, 2025

News

Your Ultimate Oil Change

Right product. Right package. Right to your door.

November 1, 2024

News

Which AMSOIL Motor Oil Is Right for You? A Comparison

No matter what you drive or how you drive, AMSOIL provides specially formulated motor oil designed to protect your vehicle.

December 11, 2023

How To

Understanding Oil Viscosity

Viscosity is the measure of a fluid’s resistance to flow.

January 17, 2023

AMSOIL Performance Testing

Laboratory tested and proven on the road.

See how AMSOIL products perform in the lab and in the field.

Check out the tests

Latest News

News

Sportsman Spotlight: The Racers and Riders Who Run AMSOIL

Meet the racers, riders and outdoor enthusiasts who partner with AMSOIL, and find out why they trust AMSOIL synthetic lubricants.

October 1, 2026

How to Make Your Car Battery Last Longer

Heat, cold starts and short trips shorten battery life. The right motor oil can help your car battery last longer.

October 1, 2026

Testimonials

AMSOIL Customer Stories: Real-World Results

Real-world results from AMSOIL customers: million-mile trucks, fleets and landscaping crews, racers and enthusiasts who put AMSOIL products to work.

September 30, 2026

News

Protecting Against LSPI – Even During Extended Drain Intervals

Signature Series 100% Synthetic Motor Oil far exceeds industry standards for protection against LSPI.

September 30, 2026

How AMSOIL Gives Back: Training Technicians, Drivers and K-9 Teams

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AMSOIL HQ

How AMSOIL Gives Back: Training Technicians, Drivers and K-9 Teams

AMSOIL supports the people who keep machines running and communities safe, including the Motorcycle Mechanic’s Institute, Team O’Neil Rally School…

September 29, 2026

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Latest Videos

Boat Maintenance Checklist: Engine and Lower Unit Tips

Avoid expensive boat repairs with this quick marine engine maintenance checklist.

August 5, 2026

Latest Events

Car Racing

AMSOIL Racing and Events: Series, Shows and Sponsorships

Every racing series, event and car show AMSOIL sponsors, from dirt track and off-road racing to snocross and the biggest…

October 1, 2026

More Events

Latest Testimonials

News

Sponsorships

Sportsman Spotlight: The Racers and Riders Who Run AMSOIL

Meet the racers, riders and outdoor enthusiasts who partner with AMSOIL, and find out why they trust AMSOIL synthetic lubricants.

October 1, 2026

AMSOIL Customer Stories: Real-World Results

Real-world results from AMSOIL customers: million-mile trucks, fleets and landscaping crews, racers and enthusiasts who put AMSOIL products to work.

September 30, 2026

More Testimonials

Product Support

Customer Service

Latest

Seasonal Maintenance Guide: Spring, Summer, Fall and Winter

Transmission Fluid and Gear Oil: The Complete Guide

Sportsman Spotlight: The Racers and Riders Who Run AMSOIL

Editor’s Picks

Turn More Heads with AMSOIL Car Care

Your Ultimate Oil Change

Which AMSOIL Motor Oil Is Right for You? A Comparison

9 Motor Oil and Car Maintenance Myths, Busted

Synthetic vs. Conventional Oil: The Differences That Matter

5W-20 vs 5W-30 vs 10W-30: What’s the Difference?

Transmission Flush vs Fluid Change: Which is Better?

How to Check Power Steering Fluid (and When to Change it)

How to Clean Fuel Injectors: Gas and Diesel

Featured

Turn More Heads with AMSOIL Car Care

Your Ultimate Oil Change

Which AMSOIL Motor Oil Is Right for You? A Comparison

Understanding Oil Viscosity

AMSOIL Performance Testing

Latest News

Sportsman Spotlight: The Racers and Riders Who Run AMSOIL

How to Make Your Car Battery Last Longer

AMSOIL Customer Stories: Real-World Results

Protecting Against LSPI – Even During Extended Drain Intervals

How AMSOIL Gives Back: Training Technicians, Drivers and K-9 Teams

Latest Videos

Boat Maintenance Checklist: Engine and Lower Unit Tips

Latest Events

AMSOIL Racing and Events: Series, Shows and Sponsorships

Latest Testimonials

Sportsman Spotlight: The Racers and Riders Who Run AMSOIL

AMSOIL Customer Stories: Real-World Results

AMSOIL Performance Testing

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