AMSOIL Shipping Information
Online StoreAMSOIL Preferred Customer ProgramAMSOIL Business AccountsAMSOIL Dealership OpportunityOrder FREE AMSOIL Product CatalogContact Us
Email Price List

What Is Oxidation And How Does It Affect Engine Oil


Oxidation occurs when the addition of oxygen changes a chemical substance. Using an apple as an example. Oxygen will quickly cause a cut apple to turn brown. Or metal, oxygen can cause rust to form on some metals in a matter of days. Have you ever noticed your brakes grinding after having left your car sit for a couple days in wet weather? That sound is your brake pads scouring rust from the rotors.

Motor oil isn’t immune to oxidation. As oil reacts with oxygen, a permanent chemical change occurs that causes oil molecules to lose one or more electrons.

    Several problems can evolve from this, including…
  • Formation of sludge and deposits that reduce engine efficiency and increase the risk of engine failure
  • Increased oil viscosity, which reduces fuel efficiency
  • Additive depletion, reducing the oil’s effectiveness
  • Accelerated degradation, causing you to change oil more often

Heat Speeds Up The Oxidation Process

Every 18°F (10°C) increase in temperature doubles the rate of oxidation. That doesn’t bode well for motorists driving modern turbocharged vehicles that create increased heat compared to older vehicles.

Heat isn’t the only oxidation accelerant – certain metals, acids and water can also hasten oxidation. So can large volumes of entrained air, known as foaming.

Can Oil Oxidation Be Prevented?

Unfortunately, no. Nature is a relentless force, and all motor oil will eventually oxidize to some extent. However, we can dramatically slow oxidation through use of synthetic base oils and quality oxidation-inhibitor additives.

Did You Know?

AMSOIL synthetic lubricants are formulated using base oils with a saturated molecular structure, meaning oxygen is prevented from attaching. This provides built-in heat and oxidation stability compared to unsaturated conventional oils.

As well, since AMSOIL synthetic lubricants don’t contain contaminants like conventional oils, their base composition doesn’t accelerate oxidation.

AMSOIL synthetic lubricants also contain high-quality oxidation inhibitors. These additives are sacrificial in nature, meaning they’re designed to deplete over time. Because AMSOIL synthetic lubricants have built-in oxidation resistance, their oxidation inhibitors last longer since they don’t deplete as rapidly.

What does this mean to me and my car or truck or motorcycle?

    It means you can rely on a motor oil that:
  • Lasts longer despite intense heat and stress
  • Helps keep your engine cleaner and more efficient
  • Saves money in the long run through reduced maintenance

While oxygen around you lets you breathe, AMSOIL synthetic motor oil lets you breath easier since your engine is protected against oxidation.

What Products Do You Need?

Look Up Your Vehicle Using the AMSOIL Product Guides By Clicking the Image

Use AMSOIL look-up guides to find products for your vehicle

Was this page helpful?

(click on a star to rate)

Blog Title: What Causes Oxidation In Oil?
Current Rating: 4.5 out of 5 stars
Votes & Reviews: 1 vote(s) and 0 user reviews.

Share your comments
or ask a question

smaller | bigger


Price List Request

Receive wholesale price list in your email.