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Used Engine on 1999 Volkswagen Passat

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How will you know the miles?
(1) Answer
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A used engine is always a risk. You have no way of knowing the mileage. I would always remove the valve cover look the oil was changed frequently (if so the engine should be clean inside not dirty black), I would remove the oil pan and check the bearings, and if all is OK I would replace the timing belt, seals and water pump.