What Causes Motor Oil Contamination?

Checking oil for contamination

Motor oil contamination is the result of chemical changes to the oil, in addition to the accumulation of dirt, fuel, metal particles and other contaminants.



What Are Piston Rings?

What do piston rings do?

Piston rings seal the combustion chamber, keeping combustion gases in and oil out. Properly working piston rings are vital to maximizing engine power.



How Much Oil Does My Car Need?

How much oil does my car need?

Find out how much motor oil your car needs using the AMSOIL Product Guide. It’s fast, free and convenient. Find out more here.



Which Car Oil is Right for my Vehicle?

Oil bottles on a retail shelf

When deciding which oil to use in your car, ensure you use the correct viscosity of oil that meets the correct performance specifications.



Additives in Motor Oil: Everything You Need to Know

Additives in motor oil

Additives in motor oil perform two critical functions: lessen destructive processes and enhance the beneficial properties of the base oil. Here’s a rundown.



What is the Shelf Life of AMSOIL Synthetic Motor Oil?

AMSOIL shelf life

AMSOIL shelf life for motor oil is up to five years if your follow a few simple storage guidelines. AMSOIL synthetic grease can last up to two years.



Can I Use Diesel Oil in My Gas Engine?

You can use diesel oil in a gas engine provided the diesel oil meets the appropriate specifications and viscosity requirements of your engine.



Do Motor Oil Additives Work?

Oil bottles on a retail shelf

Oil additives promise several enticing benefits, like improved fuel economy, reduced friction and better wear protection. Find out if you should use them.



Can I Mix Synthetic and Conventional Oil?

Signature Series oil change

While it’s safe to mix synthetic and conventional oil since they’re compatible, it’s not a great idea. Here’s why you shouldn’t mix oil types.



A Beginner’s Guide to Motor Oil: What You Need to Know

Pulling oil dipstick

Motor oil seems simple. You pour it in your engine and drive away. But motor oil is far more complex…and important. Here’s what you need to know.