Slight oil weep from the cam plug on passenger side of motor, dripped down onto the block and radiator hose over time, left a big stain. Tried to replace myself, removed the valve cover and 4 housing screws for the cam holder, and COULD NOT get it off no matter how hard I tried. After hours of frustration I finally took it to the dealer and forked over $270 to get it fixed. Easy to do yourself but it's a pain to get the cam holder off. Common problem on Integras.