my mom has a '99 blazer w/4.3l with only about 40,000 miles on it. its had a slow leak for a while. its not too heavy, maybe a 1/2 qt per oil change. it just enough to make a couple drops on the ground when parked for a few days and to make the underside of the engine wet. initially i though it was the oil filter housing, but it looks like its actually above that. i'm thinking it might be one of the lines that goes from the pil filter housing to the oil cooler. its on of those steel to rubber lines. how common is it for one of those steel to rubber lines to leak...maybe at the joint?? thanks