6 Hard-Learned Automotive Lessons That Changed Everything

At Hagerty Media, we pride ourselves on knowledge—but we also embrace the fact that nobody knows everything. Growth comes from learning, and sometimes, that learning happens the hard way. Here are six tough lessons our team members learned through experience, each making them better at what they do. What automotive lesson taught you the most? Share your stories in the comments.

Pump the Brakes: Don’t Work When You’re Tired

Eddy Eckart, Hagerty Media

Never attempt process-oriented tasks when you’re exhausted. This is a lesson I’ve had to relearn multiple times because my default tendency is to push forward regardless of my energy levels.

A few nights ago, I began reassembling the Boxster brake calipers I’d sent out for powder-coating. The pins securing the brake pads differ from front to rear and are held in place by dowel pins, which must be hammered in. I was certain I was working on a rear caliper—until I wasn’t. I only realized my mistake after driving the dowel pins in, forcing me to drill them out and start over.

How could I confuse front and rear calipers? They’re not dimensionally distinct, and a foggy brain leads to careless errors.

(Two-day postscript: Another lesson I do follow is knowing the right person for every job. After struggling to drill the pins myself, I enlisted a machine shop. The caliper without dowel pins was ready for pickup today.)

The Right Tool for the Job: Preparation Prevents Disaster

Nik Berg, Hagerty Media

Always gather the proper tools before beginning a repair. A few months back, I decided to replace the rocker cover gaskets on my Lotus Esprit, which were leaking oil. Removing the covers was straightforward, but the bolts required an exact, equal, and unusually low torque setting. I assumed I could manage it by trial and error—a big mistake.

I spent hours adjusting each bolt, yet the oil continued to leak. In the end, I surrendered and took the car to a specialist. What should have been a simple job became impossible without the right wrench.

Don’t Nap on Your Engine: Double-Check Your Work

Sajeev Mehta, Hagerty Media

Always inspect your work for collateral damage. This lesson grows more critical as modern engines rely on aged plastic and rubber components in complex, turbocharged systems.

My 31-year-old Lincoln Mark VIII needed a new idle control valve (IAC). To access it, I had to climb on top of the engine. The throttle body assembly holding the IAC bolts to is less than an inch away from the serpentine belt. During the process, I accidentally nicked the belt with a wrench, leaving a small but dangerous gouge. Had I not caught it, the belt could have failed catastrophically.

Know Your Limits: When to Call a Professional

David Traver Adolphus, Hagerty Media

Recognize when a job is beyond your skill set. A few years ago, I attempted to rebuild the carburetor on my 1972 Triumph Spitfire. The process seemed simple enough—until I discovered the throttle linkage was seized. After hours of struggle, I realized I lacked the specialized tools and experience to complete the job properly.

I eventually took the car to a professional, who completed the rebuild in under an hour. The experience taught me humility—and the value of knowing when to seek help.

Patience Pays Off: Rushing Leads to Costly Mistakes

Matt Litwin, Hagerty Media

Take your time, even when you’re eager to finish. A few summers ago, I decided to refresh the paint on my 1967 Chevrolet Chevelle. Eager to see the results, I rushed through the sanding and priming stages. The outcome? A rough, uneven finish that required stripping and starting over.

This taught me that patience isn’t just a virtue—it’s a necessity. Skipping steps to save time often leads to far greater delays and expenses.

Document Everything: The Power of a Detailed Record

Drew Hardin, Hagerty Media

Keep meticulous records of every repair and modification. Years ago, I worked on a project car without documenting my progress. When I later needed to reference a specific torque spec or part number, I found myself guessing—and guessing wrong.

Since then, I’ve made it a habit to log every detail, from bolt sizes to fluid types. This habit has saved me countless hours and headaches, proving that a little organization goes a long way.

What’s Your Hard-Learned Lesson?

Have you faced an automotive challenge that taught you a valuable lesson? Share your stories in the comments below. Every mistake is a step toward mastery.