Welcome to another edition of the Car Dealership Guy Podcast Recap—a rundown of key lessons from top operators, founders, and execs shaping the future of auto retail.
Today’s guest is Corina Straub Diehl, CEO and President at Diehl Automotive Group.
After the sudden loss of her husband in 2007, Corina ignored advice to sell the business and instead scaled it into a 24-store powerhouse generating over a billion dollars in revenue.
Every deal has to pencil on a 5-year ROI, and that number is non-negotiable
Acquisitions at Diehl are evaluated against one consistent benchmark. Whether the store is underperforming or running like a machine, the math has to work inside the same window.
"I'm looking for a 5-year ROI on these stores. I mean, that's where my head's at. That's where I want to be."
Underperforming stores justify a higher multiple because there's room to grow into it, but the ceiling on what she'll pay is always anchored to that same return horizon.
Nothing comes out of a new store until the debt is meaningfully paid down
Capital discipline is what allowed the group to keep compounding. When a store is acquired, profitability stays inside the operation until it's earned its place.
"When we get into a store, we pull zero dollars out of the store until it's really profitable and we've paid a good portion of the notes down."
That approach requires patience, but it's a direct reason why the group has been able to absorb multiple acquisitions without overleveraging.
Paying a high multiple for an exotic franchise is buying a bond, not a dealership
When a high-line opportunity came across, the math didn't close in any reasonable timeframe. The investment thesis is fundamentally different from a volume franchise.
"I went, 'Son, if you want to do this, you'll enjoy it if you're lucky in 25 years.' I would not take the risk. I mean, there's certain point that I can't make it work in my brain. I'd rather buy three Kia stores, three Chevy stores where I know I'm going to be okay."
The preference for volume franchises is about matching the investment structure to a return window that actually makes sense for the group.
Eleven collision centers work because they keep customers in the ecosystem and supply parts at full margin
Most dealers think of collision as a standalone business. The integration logic at Diehl runs deeper because parts supply, recon, customer retention, and lead generation all flow through the same centers.
"I'm supplying parts to all of my collision centers, right? And they aren't really discounted. I'm servicing my customers. Everybody has car issues, right? Everybody scrapes their car, has a bumper problem, has major accidents. So, my customers aren't leaving my hands."
On top of that, every totaled car is a warm handoff to the nearest store GM, converting an insurance claim into a conquest opportunity.
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Some stores are better left alone, because if the DNA is already working, don't break it
One acquisition came with a sales team writing thank-you notes and birthday cards, closing at a level no other store in the group has matched. The integration decision was to change the DMS and leave everything else intact.
"These guys are writing thank you notes and birthday cards and...that store had been around a hundred years and honestly we have essentially um left that—we changed the operating system right."
A hundred years of embedded customer culture isn't something that can be replicated through process rollout, so the only smart move is to protect it.
The succession transition works because she and her son align privately before he drives publicly
Matt handles negotiations, setup, and paperwork. Corina sets the ceiling and reviews the financials alongside him. From the outside, he's running the deal, but the direction is set together.
"Again, I'm in the back—we're dictating, him and I together."
That structure lets Matt build credibility and relationships with sellers while preserving the experience and judgment she's accumulated across 19 years of acquisitions.
A customer complaint that reaches the CEO means every layer of management has already failed
When an email gets escalated all the way up, it's a process breakdown at the GM level, the service director level, and every step in between.
"If they went to the extent to reach out to me, we have a problem. Because there have been a lot of things that have failed along the way and a lot of people that have failed. Think about it, right?…We have a problem."
The response is always the same: Pull the ROs, get the objective data first, and then make sure it doesn't happen again, because it should never get that far.
Growth compounds when you keep the same people for 19 years
The Butler campus has operated with largely the same team since her husband passed. That kind of retention is the result of how people are treated and how accountability is modeled from the top.
"It takes really good people. I get all the credit in the world for what we've done. And I look around, if you come to my Butler campus, I probably have had the same people there for 19 years."
At 24 stores and a thousand-plus employees, the limiting factor on further growth is whether the directors have enough bandwidth to run what they already have.
She didn't like the car business for the first 19 years, but did it anyway
The honest answer to whether she loves what she does comes with a timeline attached. The early years weren't passionate because they were a necessity, a legacy, and a responsibility to the people still working there.
"If you would have asked me that 18 years ago, 19 years ago, the answer was no. I despised it. I despised how I was treated. You know, I'm a woman in a male-dominated industry...I did it out of necessity for Matt's legacy to support my family to support the people that were still there."
What changed over the years was the position she built within it, and the team she built around her to run it the right way.
The stores most dealers won't touch are often the ones with the most room to run
The Robinson CDJ store came with a collision center losing $28,000 a month. Accountants told her not to buy it, but she bought it anyway, spent $4.5 million building it out, and it's now one of the group's most profitable operations.
"I was hellbent on buying it. Bought the store that had a collision center. It was losing when I bought it $28,000 a month and it kept losing money. And what is it doing today? It's making money."
Her take: The willingness to buy underperforming assets and grind through the losses is exactly what creates the margin of return that clean, well-run stores can't offer.
