Originally posted by foofighter24
My point was that they can tell you about condition now, but they can't predict the future. You are still buying something with wear and older parts that is outside of the warranty. Even a great mechanic is not a fortune teller.
Leakdown, and compression test are actually a great indicator of how the car was taken care of, and the overall health of an engine. A car that was abused like your example that you gave will likely have components in the engine that have increased wear. These test, even on a newer car will be able to show you the health of the engine. If your headgasket is in poor repair, or for some reason the insides of your engine are getting worn, or your piston rings are going bad this test will tell you. On a 5 year vehicle, assuming you avoid certain cars your chances are you will have an engine that will run for YEARS without trouble, assuming you do your part.
Buying used cars is not as perilous as you're making it seem. Vehicles from around 2010 are very reliable, and relatively trouble free comparatively, considering you buy from the right brand, and pick the right model. Now --- in a few years I would avoid used cars. I really don't like what is happening to the auto industry, with 2012 cars and above we hardly have anybody that can diagnose, and work on the electrical systems. Some Mercedes for example have around 90 computer modules, and there are a lot of issues that can go on with them. Plus on newer cars nobody knows how to fix them anymore, even at the dealerships. There are very few people who can, and generally they leave the shop environment and either start their own shops or become diagnostics consultants.
The next thing you have to consider about used cars is their is usually a lot of information on them. People already know their pattern wear, and understand and know all of the issues with the car. With new vehicles you are the BETA tester, especially on new platforms. If you buy a vehicle that is filled with problems, and a lemon, you're not going to get years of usage out of it. Scion FRS buyers are very sad right, they bought a car that is riddled with faulty injectors. Toyota is ignoring the problem, Toyota also has another problem, their new engines piston rings are going out at low mileage, and causing the cars compression to go down at extremely high rates. This leads to low power, bad gas mileage, and premature engine failure. They are ignoring the problem because they don't want to pay for it, and most modern day consumers don't check for oil consumption. This is a problem most people don't catch until their car is out of warranty, manufacturers do this all of the time so they don't have to pay for warranties.