Help! Last night, I noticed a thin trail of oil while parking my 2005 Cayenne S which has 11K miles. I am no expert, but the oil does not appear to be engine oil, at least to my touch. This morning I found a small puddle of oil under the front left side of the truck. I am planning to get an appointment at my dealership on Monday to have them look at it... Would anyone know where this oil could be from? Has anyone experienced this?