DEF is easy to contaminate, and fortunately, it’s also easy to test. Check to be sure that your customers’ DEF is up to spec with these simple tests.

Crank fasteners are often a real pain to remove. Mechanics with expensive impact wrenches and large breaker bars struggle to remove them—but there’s a better way.
Unless you’re a professional mechanic or a hardcore DIYer, I suggest you focus on building memories instead of a car.
Under what conditions would the EGR system be expected to be operational? We have the correct answer.
Auto care news and advice you can use.
Why you should use standard operating procedures for customer communications.
Faults in the car pay you. Faults in the scanner cost you.
If you’re an experienced technician, you may feel as though you’ve seen everything, but don’t let your knowledge prevent you from learning more.
Especially for your mechanically-inclined clientele, sometimes a fingerful of clean grease is a lifesaver.
A fellow YouTuber recommended it. Why not give it a try?
Shop Press is the news and idea hub for everything related to working on cars and trucks, focusing on repair, technology, and wrenching lifestyle. With interesting stories from around the world, features on creative people and solutions, and all kinds of other stuff that’ll make you use your mind and your hands.
Auto care news and advice you can use.
When plastic parts break, sometimes replacements can be prohibitively expensive or hard to find. Learn how to use a hot staple tool to salvage broken plastics for auto repairs and other projects.
They look the same, but serve different roles. Here are the very specific scenarios where the lesser-known parallel connector shines.
Shop Press’ Andy Greaser breaks down permanent antifreeze and today’s coolant for your vehicles.
As new cars and trucks, especially EVs, get heavier than ever, it’s important to check your lift’s rating and condition.
One basic vehicle checkover has several lessons to teach.
Do your customers know the benefits of magnetic oil drain plugs? Swap out their standard drain plugs to help protect against unnecessary engine damage.
A customer states the brake pedal falls slightly when the brakes are applied while starting the engine. Which technician response is correct?
In November 1988, two employees snuck a camera into AMC’s Kenosha plant for a farewell tour.