I too have a similar leak, its is oil , I can not see the source the only way i found it was the burt oil smell. Mine is only on the passager side, I can see small amount of oil on the cyclinder head but no damage to the gasket or anything around the area. I have put 2,000 miles since I first notice it maybe 1/4 quart of oil has been lost. I tried stop leak , did not seem to do anything. I don't want to take the car apart chasing a ghost .