Hey guys, noticed a touch of smoke earlier while idleing in traffic for 5 mins, it was oil as it was blue, whats the easiest way to rule out turbo/stem seals/rings? Im thinking (or hopeing!!) its the usual turbo shaped culprit but whats the easiest/quickest way to put your finger on it?Car is a '90 4x4 saph, standard tune, t3 etc etc only mods are exhaust & filter.