Although I have never commented on another brokers or writer's opinion, in this case, I will (but of course not personal in anyway).
I understand the novice automotive business buyer scenario that you wrote about several times throughout BizBuySell is always a possibility, but it is VERY narrow-viewed and entirely based on fear, not to mention, that fear-based scenario can apply to all businesses and in all industries. When you're understaffed, you manage it. The End.
You DO NOT have to be a mechanic to buy, manage or operate an automotive business!
I have over 25 years in the automotive industry and started my niche market business brokerage and commercial real estate firm selling automotive businesses, franchises and commercial real estate in 2007 and have helped dozens of buyers with no automotive experience acquire, build and succeed in the automotive industry.
The automotive industry is an EXTREMELY safe and solid industry to own a business. The high price of new cars encourages auto owners to keep their used car longer (11.1 year avg as of 2014) and most automotive owners prefer not to pay $125.00-$165.00 per labor hour to have their new car dealership repair their vehicle, which leaves the independent business or franchise owner to service the vehicles.
Although I recommend "learning" the buzzwords (which the technicians will gladly teach you because they want to stay busy) and understand what they mean for the purposes of communicating with your customers and technicians, the ability to turn wrenches is NOT required and many cases NOT RECOMMENDED.
Why? Because your job as owner and/or CSR (customer service representative) is to understand your customer and to be able to communicate with people in an honest and trustworthy manner, manage the staff and grow the business.
In many cases, mechanics do not make very good CSR's. They are not accustomed to communicating "pleasantly" with customers and they tend to side with the issues of the technician and not their customer. For example, If they feel their buddy-technicians don't like to perform oil changes (because there's no money in it for them), then they'll turn the job away, siting they are too busy, or scheduling the job far into the future knowing the customer needs the work done ASAP, etc.
The business owner knows very well there is no money in Oil Changes, however the owner is constantly trying to build his/her customer base. They need new customers and want to keep existing customers while their competition is trying to steal their customers everyday through mailings, coupons, TV & radio advertising, etc.
"Your competition is working 24/7/365 to kick your ass"- Mark Cuban
Finally, to be a successful automotive business owner, you DO NOT need to be a mechanic!
Please consider my letter prior to providing automotive business entrepreneurship advice to common-folk in an industry where your advice is not sound.
Again, none of this is personal in anyway, just trying to set the record straight for the public and maybe help you understand the industry as well.
Have a GREAT day!