Hello people let my introduce myself my name was Robert from san juan pr im new in the forum and i need your expertise right here.im going to change the geor oil of the differential and the oil is 75w90 but the transfer oil my cayenne 2006 need is the oem porsche that in pr co$$$t a lot!!!and i make my research and notice that the bmw's x5 uses the same oil and cost a lot less!!!let me know it is true or false??or i can use the same transfer oil from the vw touareg??help me with this issue people ok thanks for your help.