Turn the ignition on but not the engine. Watch for the lights, all should come on. If not, do not buy because that says it been tampered with.

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Check and make sure the oil looks like oil, or black, but not milky (coffee with creamer look).

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While in park, shift gears and watch for any delay. That will tell you if your transmission is bad

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Look at all the tires. If they have put a complete set and not mismatched, this tells you they take care of the car

look at the coolant. Is it water or is it actual coolant? If its coolant, they take care of their car

Get the carfax