Well im in a situation now found where my oil leak was coming from.the main shaft bearings have a retaining nut either side one had slackened off causing the nut to tear the shaft seal.at least it's been found early with minimal damage as its only damaged a seal.now i have to find a seal thats going to withstand heat,speed and retain the oil in the charger but also clear the nut that rotates on the main shaft.im looking at viton seals there ideal for heat and rotating.time for some head scratching now.hopefully update this with a solution soon