I know it isn't the same exact engine, but I had an e30 with around 300,000 miles before I sold it and my current daily driver, a 1994 e36 325i, has 296,000 miles and it runs pretty smooth. It does burns about a quart and a half of oil every 3,000 miles, but that doesn't seem excessive. Especially considering how hard I drive it.

BMW sixes are bulletproof. Change the oil reqularly with OEM filters and you will be good for a very, very long time barring some sort of freak failure.

__________________
Profeshenal spellar