I developed a pin hole in one of the oil cooler lines that runs from the block to the cooler. This is a common problem when the bracket breaks that holds the lines in place where they go thru the area below the motor mount and the line rubs on a bolt until it wears thru.
Before you go anywhere crawl underneath and have a look. It might save you a breakdown on your next trip. I would recommend some wire ties even if the bracket isn't broken yet.
Vince Sadowski