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Boat Maintenance Checklist: Engine and Lower Unit Tips

Boat Maintenance Checklist: Engine and Lower Unit Tips

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

August 5, 2026

Can You Use Car Oil in a Boat? Why Marine Oil Matters.

Can You Use Car Oil in a Boat? Why Marine Oil Matters.

Learn why marine engines need purpose-built oil that handles sustained load, high rpm, water exposure, corrosion and storage.

August 5, 2026

New Formula, Same Promise: Maximum Engine Life and Performance

News

New Formula, Same Promise: Maximum Engine Life and Performance

We discuss the next-generation Signature Series 100% Synthetic Motor Oil with AMSOIL Chairman & CEO Alan Amatuzio.

August 3, 2026

Editor’s Picks

Turn More Heads with AMSOIL Car Care

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.

Your Ultimate Oil Change

News

Your Ultimate Oil Change

Right product. Right package. Right to your door.

What AMSOIL Motor Oil is Right for You?

News

What AMSOIL Motor Oil is Right for You?

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

Top 5 Motor Oil Myths Busted

Top 5 Motor Oil Myths Busted

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

Synthetic vs. Conventional Oil: The Definitive Guide

Synthetic vs. Conventional Oil: The Definitive Guide

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?

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?

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 Check Power Steering Fluid (and When to Change it)

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 your Gas and Diesel Fuel Injectors

How to Clean your Gas and Diesel Fuel Injectors

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

Featured

Turn More Heads with AMSOIL Car Care

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

Your Ultimate Oil Change

News

Your Ultimate Oil Change

Right product. Right package. Right to your door.

November 1, 2024

What AMSOIL Motor Oil is Right for You?

News

What AMSOIL Motor Oil is Right for You?

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

December 11, 2023

Understanding Oil Viscosity

How To

Understanding Oil Viscosity

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

January 17, 2023

What Does Oil Viscosity Mean

Oil viscosity is the measure of its resistance to flow. How quickly or slowly motor oil flows affects how well it protects your engine.

Latest News

Boat Maintenance Checklist: Engine and Lower Unit Tips

Boat Maintenance Checklist: Engine and Lower Unit Tips

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

August 5, 2026

Can You Use Car Oil in a Boat? Why Marine Oil Matters.

Can You Use Car Oil in a Boat? Why Marine Oil Matters.

Learn why marine engines need purpose-built oil that handles sustained load, high rpm, water exposure, corrosion and storage.

August 5, 2026

New Formula, Same Promise: Maximum Engine Life and Performance

News

New Formula, Same Promise: Maximum Engine Life and Performance

We discuss the next-generation Signature Series 100% Synthetic Motor Oil with AMSOIL Chairman & CEO Alan Amatuzio.

August 3, 2026

A Data-Driven Guide to Slashing Maintenance Costs with AMSOIL

News

A Data-Driven Guide to Slashing Maintenance Costs with AMSOIL

Running AMSOIL synthetic motor oil can reduce maintenance costs, prolong vehicle life and reduce the number of oil changes needed.

July 29, 2026

How Engine Sludge Forms. And How to Prevent It.

How Engine Sludge Forms. And How to Prevent It.

Engine sludge is a black gelatinous substance that wreaks havoc in engines.

July 29, 2026

Latest Videos

Boat Maintenance Checklist: Engine and Lower Unit Tips

Boat Maintenance Checklist: Engine and Lower Unit Tips

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

August 5, 2026

Latest Events

Riding to Sturgis? Try These Tips.

How To

Riding to Sturgis? Try These Tips.

These practices can help make your adventure to Sturgis Motorcycle Rally more enjoyable.

July 16, 2026

Latest Testimonials

Sportsman Spotlight: John & Krista Long

Sportsman Spotlight: John & Krista Long

A racing program rooted in hard-earned experience, mechanical self-sufficiency and the relentless pursuit of performance.

April 29, 2026

40,000-Mile Polaris Snowmobile

40,000-Mile Polaris Snowmobile

Tom Holzwarth accumulated more than 40,000 miles with no engine problems using AMSOIL INTERCEPTOR® Synthetic 2-Stroke Oil.

April 8, 2026

More Testimonials

SYNTHETIC VS. CONVENTIONAL

Although you might know that synthetic oils outperform conventional oils, you might not understand why. The differences begin at the molecular level.

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