Hi forum, This seems to be a question that has been asked over and over again but since there are no other Q & A here Ill start. I have just bought recently a 1985 carrera 3.2 and want to know peoples experiences with different brands of oil.Synthetic or non synthetic ? Under the engine cowl I have a Shell oil sticker which looks to me to be factory placed and was wondering if this is or was what Porsche were using and recomending for these engines.If so I assume that this was for new en