The E34 540i (Pre 1997) sometimes had a problem with the nicasil lining in the cylindars but by now, most of the ones that were going to have a problem with it have already surfaced and been repaired. 540's are also known for a plastic waterneck that breaks easily but can be replaced with an aluminum one. See the sticky at the top for things to look for in E39 5 series (1997 to 2003)
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1999 528i 5 Speed, Sport Package, Confortti Software, Racing Dynamics Front Lip Spoiler and Rear Apron, Supersprint Muffler, Angel Eyes Upgrade.