BMW Questions? Ask a BMW Repair Expert for Answers.
Used engines are fine to use just buy it from a reputable scrap yard and with a warranty so if there is a issue with burning oil you can get it replaced.
No they don't have a history of smoking and yes it is a reliable engine as long as it is maintained.
Cooling system parts oil filter housing gasket, valve cover gasket. And with the valve cover removed you can tell the service life of the engine. Lots of gunk build up means neglect nut none means well maintained.
not really but I would return the engine and get another. Just oil changes.
Thats unfortunate if it is gunked up you would need to tear it down and clean and rebuild the engine.
Doesnt sound like you have a lot of choices if no one will stand behind a used engine and a new unit would be too expensive.
That is a tough decision. For another $7k you could get another one and use this one as a parts car. I would not recommend putting the cost of a vehicle into the vehicle.