I have recently purchased a 1998 Proline w/ a 200 Mercury o/b. My mechanic conducted a complete engine check and winterized it for me. I just noticed today that a small amount of oil is leaking from around the bottom of the prop and down the skeg the motor is in the fully down position. It is a brownish/clear oil and I was wonder what the source of this problem could be. (The mechanic pressure tested and replaced the lower unit oil if this is any help) I am concerned about possible water leaking into the lower unit and cracking it, if that is where it is coming from.