I know that this is a bit of a thread spin-off, but here pretty soon the resale value on anything used (clean CarFax or not) is going to nose dive. We've been heading towards a used car market crash like the real estate one years ago for a while now, and it's very close to happening, if not already.
Lenders for the last several years have been doing the exact same thing they did to create the real estate crash by doing tons of sub-prime loans. You can even get a 96 month loan on a car now. That's insane.
I read recently where there are over 7 million people in the US who are currently 90 days or more past due on their auto loans.
So, soon you're going to have a massive influx of 1-4 year old used vehicles to the market from all the repos, which is going to tank the values of everything. Exactly what happened with the housing market.
There's going to be so many cheap 1-4 year old vehicles on the market, it's going to then also be hard to sell anything 5+ years old for any kind of decent money.
We're headed towards a used car market that will be great for buyers but suck for sellers for a while. The market will correct/recover, just like it has with the housing market, but it will take a few years.