hi, i have a 2002 x5 4.4i, lately iv been noticing that once i have driven my car around for a while and then parked it up for a couple hours and then go to start it again i get this knocking type noise on start up which lasts for a couple of seconds and then vanishes, it never seems to happens on first start up in the mornings, its always after its been driven and then parked up for a while.

any ideas what could be causing this?

Any help would be much appreciated

thanks in advance

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x5 is gone