The other day I noticed some oil down by the head gasket I thought it was from me pulling the dip stick out and some oil flung off, but no such luck.It is there again today.I called my friend and he said the oil passage hole in the head gasket could be gone I recently changed my oil to synthetic and i was wondering if it could be from the synthetic when it heats up it gets really thin.My tempature gauge never goes past half,is this alright or should it be replaced my car is stored anywhy so i am not driving it now. by the way it is a 93 civic with a integra motor