Hi Steve, The main bolt holding the pulleys came loose and the turbo malfunctioned. We drove the car ( after the turbo refurbishment ) to Spain and back with no trouble at all. Your second ? is way above my knowledge. ( I am a 76 year old and having a job keeping up with modern technology ). I will ask my garage for this information and pass it on to you as soon as I get it. Thank you for trying to help me Best regards Mike