I need some advice. I have what was a flawless, low mileage (76000) 2006 x5 3L. A few weeks ago the oil separator froze up when it was sub zero and destroyed the engine. We thought it was salvageable at first but today found out I am looking at a $5000 bill to replace with a used engine. Question is.....is it worth it first of all? Second, anyone know in the states where to get a good used engine and not get screwed? What's the car worth to sell as a parts car? Just don't know what to do. Suggestions?

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2006 BMW x5 e53, M54, steel grey, black leather, pano roof, cold weather package, avic-z150bh head unit with JL Audio amp and speakers.