jghilino 
I sell/flip used cars from time to time, ive been hit with this scheme a couple times in the last few years so id though id share it here for informative purposes. I am a skilled mechanic so obviously haven't fallen for it.
Heres how the compression scheme works:
The buyer comes to take a look at your car.
They want you to open the hood so they can run a compression check / test.
They hook up the compression gauge and tell you to go turn over the motor.
You crank over the motor then get out of the car and go around to see the results.
The gauge shows 0, so they tell you they want to try another cylinder.
You repeat the process and the gauge still shows 0.
They say they're not interested in the car and drive off.
You get a call from them about a half hour later and they say they want the car and will give you about half of your asking price for it.
90% of the time this scheme will work on people that dont know much about cars. What they do is they reset the compression gauge before you come around to take a look at it. They say 0 compression and it shows 0 right on the gauge.
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