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.
Easy tests for diesel exhaust fluid (DEF) contamination (VIDEO)
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HOT OFF THE PRESS
Separate gasket – ASE practice questions (VIDEO)
Which of the following is LEAST LIKELY to require a separate gasket for installation?
Smarter, not harder: relative compression testing
Analyzing a new trick I learned from an old dog.
Can’t break that crank bolt loose? You need a crank socket (VIDEO)
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.
SHOP STUFF
Auto care news and advice you can use.
“Can you drive a stick?”
It’s been asked of every new mechanic for more than a century. Does it matter in 2025?
Do you mind working on customer vehicles equipped with dash cams?
As dashboard cameras become more common, repair professionals should know how to deal with them.
The story of the very first reverse gear in an American car
Reverse is an innovation that’s easy to take for granted—but it was a revolutionary addition to the automobile.
How to get a little more (temporary) performance out of your air impact gun
“Rebuild in a can” is not the right way to fix the tool, but it will get you by until you can repair it correctly.
Are automakers starting to rethink OTA microtransactions?
Microtransactions spark unexpected microaggressions.
ABOUT SHOP PRESS
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.
SHOP STUFF
Auto care news and advice you can use.
Rules of the torque wrench, explained
A helpful video investigation of proper (and improper) torque wrench techniques and habits.
The only two mistakes you can make on your first timing belt job (and why you shouldn’t worry about them)
T-belts aren’t scary at all.
Ten (sort of serious) questions every service writer should ask
Skillful interrogation is a wonderful way to make your professional life easier. Here are a few suggestions on where to start.
TECHNICIAN CHALLENGE: Can you identify these dash lights? PART 4 (VIDEO)
Think you know your dash lights? Shop Press contributors Keith, Miriam, Chris, and Greaser try their best to identify all kinds of lights, symbols, and indicators.
Several tips to make brake line removal less of a headache
Don’t break fittings—break ‘em free.
VIDEOS
Before selling a vehicle, make sure to remove personal data (VIDEO)
Smartphones, laptops, and computers are normally cleared of all data before selling or discarding to protect personal information.
Dust Cap Tool Explained (VIDEO)
How many times have you seen a hub dust cap with ugly dents from a sloppy installation? A dust cap tool is a handy tool for installing caps on customer vehicles without damaging the cap’s appearance.
Why a magnetic drain plug is a worthwhile upgrade (VIDEO)
Do your customers know the benefits of magnetic oil drain plugs? Swap out their standard drain plugs to help protect against unnecessary engine damage.