Originally Posted by bcredliner

Regardless of the miles on the engine you won't know how the engine was treated, if the engine was ever overheated, run low on oil, ever had the oil changed, held in a lower gear at 6500rpms for 5 miles etc., etc. If the engine comes from a salvage yard you don't know how the X5 was hit, it could have been hit in the front of the engine and the damage has not yet surfaced. I suggest that the replacement engine should half or less mileage on the engine as yours so there is less chance the engine has been compromised in some way. I would track the vin back to a dealer so I could get a copy of all engine related service records. I suggest a mileage guarantee rather than warranty, to the tune of 75,000 to 100,000 miles. I suggest you negotiate now while you have the leverage. Hold contacting BMW USA while you negotiate. If Dealer does give you what you want, then go to BMW USA and calmly and assertively explain what you are unhappy and what you think is fair. If the dealer doesn't come around tell him that you are going to contact BMW USA before you do and give them one last chance to do better.