What Your Motor Oil Color Means

Black motor oil usually means the oil is doing its job. Oil that looks like chocolate milk, however, points to serious problems.



The History of Synthetic Oil (and AMSOIL)

Conventional motor oil helped doom German soldiers in the Battle of Stalingrad during World War II, intensifying efforts to find a better motor oil. Here’s the story of how synthetic oil came to be.



What Is Diesel Cetane and Why Does It Matter?

Diesel truck

Diesel cetane indicates the combustion speed of diesel fuel. Higher cetane ratings lead to maximum engine power and efficiency.



Living the Dream with Weaver Customs

Randy and Sydney Weaver, of Weaver Customs, keep raising the bar for show-stopping custom vehicles. Check out their latest build…and watch their story.



How to Prevent Diesel Fuel From Gelling

Prevent diesel fuel gelling

Diesel fuel gelling and frozen diesel can clog the fuel filter and leave you stranded. Learn why this happens and what to do to prevent it.



What is a Limited-Slip Differential (and What Type of Gear Lube Should I Use)?

Your differential allows you to corner safely while putting maximum traction to the ground. Here’s how it works, and what kind of gear lube to use.



How to Perform Oil Analysis

Oil analysis provides a glimpse inside your engine to gauge lubricant and component condition without so much as removing a bolt or bloodying a knuckle. Here’s how to do it.



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.



Ultimate Callout Challenge 2019: Our 12 Favorite Builds

Here are our 12 favorite builds from 2019 Ultimate Callout Challenge. Plus, Kenny Hauk shows off his 1947 Dodge Power Wagon.