Why Does Motor Oil Turn Black?

How to change your oil

Motor oil turns black during use for a couple reasons: 1) Heat cycles During your drive to work in the morning, your engine reaches normal operating temperature (typically 195ºF-220ºF), heating the motor oil. Then the oil cools while your car sits in the parking lot.



Why Did We Reformulate Signature Series Synthetic Motor Oil?

amsoil signature series

Simply put, we reformulated Signature Series Synthetic Motor Oil to solve problems. For all the derision heaped upon the internal-combustion engine, it remains our primary mode of propulsion. And, despite the gains of hybrids and electric vehicles, it will remain so for the foreseeable future.



The Pros and Cons of Semi-Synthetic Oils and Synthetic Blends

How to check oil properly

Scott D. Galbreath asks via our Facebook page about the pros and cons of synthetic blend motor oils. Thanks for the question, Scott. Making sense of motor oil can be confusing and frustrating. Choosing among full synthetics, synthetic blends, semi-conventional, conventional, high-mileage full synthetics and synthetic blends is just the beginning.



Do Older Vehicles Need High Zinc Motor Oil?

50s era Chevy Bel Air

Thanks to Hugh Ashburn for asking this question on our Facebook page. I assume when you say “older,” you mean a classic car or hot rod with a flat-tappet camshaft. Compared to their roller-cam counterparts, flat-tappet cams undergo sliding contact rather than rolling contact.



What is Synthetic Motor Oil?

AMSOIL Sig Series SAE 5W-30

As most of my friends know, and you now as well, I listen to audio books during my daily commute. My current book, about history’s first billionaire, is titled “Titan: The Life of John D. Rockefeller, Sr.” It’s a massive book about a massively complex man, and it’s been a fascinating “read.”



How Much “Synthetic” Is In My Oil?

Pouring oil

Unlike food and drug companies, which must disclose the ingredients in their products, lubricant manufactures aren’t held to the same mandate, which can cause confusion if you’re shopping for synthetic motor oil. Store shelves are lined with oils described as “full synthetic,” “semi-synthetic,” “synthetic” and even “100% synthetic.”



Synthetic Oil Beats Conventional in AAA Test

Pouring oil

My mother took the Culligan Man to task not long ago. Not the flesh-and-blood Culligan Man, but the actor on TV. It happened when I was visiting my folks during lunch. I have lunch at my parent’s house here in Superior, Wis., every Wednesday.



Why do European Vehicles Require Special Oil?

BMW

For all the grin-inducing benefits of owning a European car – finely tuned performance, sophisticated styling, prestige – they can be a pain to own. According to this list, four of the top five most expensive vehicles to maintain hail from across the pond.



How Does Motor Oil Become Contaminated?

Motor oil deteriorates and becomes unfit for service due to accumulation of contaminants in the oil and chemical changes (additive depletion and oxidation) in the oil itself.



Can Your Motor Oil Handle the Seven Responsibilities of a Lubricant?

Most motorists understand the primary functions of motor oil: reduce friction and wear. However, motor oil and other lubricants must do more to protect your vehicles and equipment. With engines and equipment becoming more powerful and sophisticated, it takes a properly formulated, well-balanced lubricant to carry out these seven critical functions.