1. Exhaust Smoke - let the engine warm up, observe color of smoke. there shouldn't be any color (white smoke = coolant in combustion chamber, blue smoke = oil in combustion chamber, grey/black smoke = rich air fuel mixture). If rear bumper is oily after a long drive, that indicates oil is in the exhaust
2. Fluid leaks in engine bay and condition of the engine bay (check hoses, connectors, belt tension, electrical connections). Look on hood of the car for evidence of fluid spraying onto it. Fluid leaks under car.
3. Milky or cloudy engine oil, or thick sludgy oil/deposits (could indicate no regular oil changes)
4. Excessive rust. Look for holes, frame damage, body damage (panel gaps on the body). Look for matching paint colors. Look under the car.
5. OBDII codes
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