congrats - that is some serious mileage. I'm just barely 1/3 of the way there myself. There are reports of several E38's with 200K+ and I recall seeing a few up over 300K, many on the original transmission as well. So it can happen, although it doesn't always work out that way either - my buddy lost his trans at 130K miles or so, but rebuilt it and is now going on 190K in his E38. Since E38 is basically the same generation and drivetrain as the V8 E53.

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2003 4.6is - SOLD
2003 M5 Imola
2008 Mini Cooper S
2011 Mazda CX9