His 4.8 has too many miles for EAG... they almost never buy anything over 100k miles, it's usually the 20k mile garage queens that they're after. BaT would be the best bet— cars regularly sell for well over their book value there.

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2003 X5 4.6 | 2000 540i Touring

Formerly owned:
2004 Range Rover | 2000 M5 | 2000 540i/6
1995 750il | 2003 Mercedes S500 | 2003 540i/6