Surprised no one read the guy's blog in which he details how his data set was comprised.
First, his definition of quality, from the OP's linked page, in the questions section--his first answer.
Long-term quality is defined by:
1) How long the owner was willing to keep the vehicle before trading it in.
2) The mechanical condition of the vehicle with separate calculations for the engine, transmission, and powertrain.
3) The mileage of the vehicle at the time it was traded-in.
I understand #2 and #3, but length of ownership is also a factor? How about people who just buy every 3 years out of habit/keeping up with the Joneses/etc.?
His blog......found here:
https://autos.yahoo.com/blogs/motor...c-guide-10-worst-used-vehicles-222709616.html
And on his blog, he explains he ignored all used car trade-ins at new car dealerships. Why?
To remove this bias, I decided to gather data on trade-ins sent to wholesale auctions by large used-car retailers and other regional used-car retailers that don’t cater to a single automaker.
Catch that? Trade-ins sent to wholesale auctions by Carmax, et al, not new car dealers. So he examined cars sent to auction by used car lots that didn't think the vehicles were good enough to keep on their own lot. The worst of the bad.
And the way the problem areas were investigated/discovered by his crack team of auto inspectors? Again, his blog explains:
So I decided to test my guesses about used vehicles by using data from auto auctions and the problems dealers themselves disclose.
So, only the self-disclosed problems heard at auction. Not bad, but not very investigative work.....nor difficult, nor using all those trained auto inspectors.....wait, he meant the trained auto inspectors at the used car dealerships. LOL!!!
Now, in all honesty, if a dealer is found to be pushing through used cars at auction under a green light sale and not disclosing known problems, he'll get at a minimum banned from that auction and others will be informed. No dealer wants to be shut out of an auction like Mannheim. Suicide if they couldn't get to those.
Not exactly a scientific study, to say the least. Ignoring the better levels of used car trades, instead focusing on used trades at used car only dealers.
BTW....what bias do new car dealerships have? He describes it here:
Clean cars can sometimes be traded-in at a retail price, and then financed to a sub-prime car buyer for even more money. Dealers who specialize in a given car brand are usually more effective in marketing and selling that specific name, and they also get a greater share of trade-ins from the brand — along with a better selection of clean vehicles.
So, ignore new car dealership used car trades because they, the dealers, can attract more of the same brand.....heaven forbid someones buys a car, likes it, and goes back to buy another of the same brand.
And they can pay more?
Bias my butt........