How to Buy a Used Car - Pt. 3: Due Diligence (The Inspection)

Steven Lang
by Steven Lang

[Ed: Part one of Steve Lang’s updated used car buying guide is here, part two is here.]

You can rigorously apply the tests described by previous installments of this series without encountering a single setback. However when it comes to buying a used car, it pays to assume one simple salient fact: you don’t know the complete truth.

At least not yet.

When it comes to pursuing the deeper truths about a used car an experienced mechanic will inevitably become your greatest ally and advocate. For most consumers finding a knowledgeable mechanic will be the most important step in the used car buying process.

Before we talk about that, I want to be perfectly clear on this point.

A used car is guilty until proven innocent. Do not buy one without taking the car for a professional inspection.

If the seller doesn’t agree to let you do so you’re done. Period. No exceptions. Ever.

Now mechanics tend to divide into three categories: the shade-tree, the Nazi and the diligent professional.

Shade-tree mechanics are hobbyists on limited budgets. Due to the lack of equipment (or experience), they may not be familiar with the unique wear issues and maintenance needs for your vehicle. The shade-tree mechanic will look at the car’s basics, take it for a short test drive and call it good (or “not bad”).

The Nazi will attempt to perform every mechanical test known to wrenchkind. Submit the car to a standard of inspection that is rooted in la-la land. Then make you financially fearful of buying anything other than (cough! cough!) one of their vehicles.

Obviously the Nazi is a non-starter.

Often times these party members will work for dealerships (but not always), and are therefore pre-occupied with meeting their service department’s monthly quota of service hours and revenue.

Unless your next car has a prancing horse or bull at the front of it, you’re usually far better off with a diligent mechanic.

The diligent mechanic will work through a standard check list and then take the car for a test drive in a variety of operating conditions.

Diligent mechanics are experienced independent professionals with established roots in your community. To find one, I strongly recommend visiting the Mechan-X files at Cartalk.com.

I also can’t over-emphasize the importance of personal recommendations; especially from people who own the same model of car you’re considering buying. Many small to medium-sized repair shops will post testimonials on their “ego wall.”

Read them carefully.

Before the inspection takes place, write the list of the concerns you created during the test drive. When you deliver the car for inspection, go over them with the mechanic one-by-one. Make sure you both have a clear understanding of all your potential concerns.

This will provide a base line for the inspection to follow.

Some mechanics inspect used cars for a set fee. Others charge an hourly rate. In both cases, the post-list discussion should conclude with a confirmation of the probable inspection cost. Leave some leeway; you don’t want the mechanic to stop their investigations for the sake of a few bucks. (Leave your contact number for this possibility.)

The best way to build a healthy relationship with any mechanic is to simply try not to be one of “those” customers.

Just let them get on with their job. Don’t stare at the mechanic while they’re doing the inspection. In fact it’s best to leave the premises entirely. And don’t phone your mechanic two hours later and ask for a status report; wait for their call.

Once the inspection is completed, sit down for a one-on-one debrief with the mechanic who made the inspection (even if you have to come back on another day). I always prefer to speak with the actual mechanic or at least have them in attendance with the “service advisor.”

Let the mechanic speak without interruption. Some diligent mechanics will go on for quite some time; some will simply say “here’s my report.” Either way review the information and let him explain every issue and potential issue to you.

After they’re finished, don’t be afraid to say “I don’t have a clue what you’re talking about” or “Is this a sign of normal wear or abuse?”

Make your own list of trouble spots from this conversation. Note down the potential cost to repair and whether or not the issue is urgent or eventual.

Once you’re finished the play-by-play, ask a few general questions. I always ask “Did the owner do a good job maintaining this vehicle?” and “Did the owner use good parts or cheap parts?” Either of these inquiries usually invites a deeper insight with the mechanic.

If the used car has survived the inspection process without revealing any critical issues to your diligent mechanic, it’s time for the final negotiation with the owner.

Steven Lang
Steven Lang

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  • Robc123 Robc123 on Feb 27, 2014

    I want to see an article about how lots of people buy salvage cars. You see high end cars all the time that are salvage- how good or bad are they? Maybe a pre article may be about how salvage titles are gamed by sellers routing them around various states.

  • Add Lightness Add Lightness on Apr 15, 2014

    I've always been happier with cars that were broken and non-functional when I bought them than cars that ran fine when purchased. I bought broken ones cheaply and immediately dove in and got familiar with the car as I fixed it. When the next problem arose, it was not so big a deal. With the cars that were functional when I bought them, The first inevitable failure was always a rude awakening......

  • Digital wwoww
  • Probert No, they're not the future. BEV sales are growing every year, and, along with sound energy policy, result in cleaner air, lower CO2, foreign policy not based on oil, and will continue to drive like a smooth powerful nearly silent turbine. Some 19% of new car sales in 2023 were BEVs - this will continue.
  • Mishab Agree with you. Thanks for sharing this insightful update about the upcoming Mini Cooper models! It's fascinating to see Mini's shift towards electrification and the unique design elements they're incorporating into the new John Cooper Works edition.Speaking of Minis, if you're a Mini Cooper owner in Sharjah looking for spare parts or considering common repairs, you might find this article on 7 common Mini Cooper repairs quite useful. ( for reading it). It covers some of the typical issues Mini owners might encounter and offers valuable insights into maintaining these iconic cars.Looking forward to more updates on Mini's electrified lineup and the exciting changes they're bringing to the automotive industry
  • Redapple2 Love/lust a 110 diesel defender. Should buy one since the INEOS is gas only (and double the price). Had a lightweight in Greece. Wonder how this rides.
  • Ajla There is inventory on the ground but as pointed out it is generally high dollar trims of high-dollar models and at least around here dealers still aren't budging off their mandatory nitrogen tires and Summer weather protection packages.You aren't paying '21-'22 prices anymore but it's still a long way to go.
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