The X has 85000 miles on it.

I'm no expert but the old plugs looked ok to me. The platinum electrode looked tarnished and the earth electrodes looked kind of a rusty brown colour. There was no blackness or oil or deposits etc as I have seen on other plugs removed from other cars. There were no errors or missfires etc, I just decided I would change the plugs as I don't think they have ever been changed.

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E90 318i 2007 N46 2.0 Manual
E53 X5 2004 M54 3.0 Sport Auto
E83 X3 2004 M54 2.5 Auto