thanks ants oz, will check again in a weeks time for leaks, but there was no leak after a good long drive yesterday so engine went from stone cold to operating temp and no leak, compared to the tiny leak prior to the 'operation' mentioned earlier in my post....must have been the o - ring not adequately oiled....also the cv boot tactic worked...new clamp tight as a drum even more so after driving car seemed to have tightened it further,

thanks again

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