If it's only when it's cold stop worrying about nothing, mine does it hot and has done for the last 20,000 + miles, some have more clearance than others, nothing will suddenly go because of this, it will just start to drink oil, blow oil seals etc due to excess crank pressure on boost.
I am rebuilding my bottom end next year, done all the top end, and mine does regular 4/6hour + sessiosn on the rollers, went on monday, going back on today!!
It has 160,000+ miles, as far as can be certain, maybe more but certainly not less, and still pulls 375bhp.
tabetha