Hi to all, well I have noticed recently that just before starting up I hear a loud deep humming noise (and am sure it isn't the console fan) I say whilst starting up as I have a diesel engine and turn the key one notch and wait 15-20 seconds before firing x5 up.

Only thing that has changed is that on the 2nd dec I swapped out dying OEM battery for a bosch silver plus rated at 100ah/ 830cca as opposed to the oems 90ah/720cca...not an issue just curious

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E53 X5 3.0d SUV prod.date 11/2004 eng.variant M57N Europe Right hand drive N