if there is oil comming out of the seals which are on top of ur rocker cover that connect to ur throttle body then ur turbos ****ed but otherwise a little bit of oil is nuthing to worry bout. another way to check is pull off all ur piping and check if theres movement in ur turbine if there is its ****ed. i say just drive hard and if it goes its a good thing the standard r33 turbos are shit and if ur gonna hi flow t3/t4 hybrid check out united fuel injection they did mine ,mackas and shannons turbo they r ****ing good and there quick so ur car will be off the road for **** all.