‘I think my wife is having an affair’

Dear Daniel,

I really need your advice on what could be a crucial decision. I’ve suspected for some time now that my wife has been cheating on me. It’s the usual signs… phone rings but if I answer, the caller hangs up. My wife has been going out with the girls a lot recently – although when I ask their names she always says, “Just some friends from work, you don’t know them.” I always stay awake to look out for her taxi coming home, but she always walks down the street. Anyway, I have never approached the subject with my wife. I think deep down I just don’t want to know the truth, but last night she went out again and I decided to really check on her. I decided I was going to park my boat next to the garage and then hide behind it so I could get a good view of the whole street when she came home. It was at that moment, crouching behind my boat, that I noticed that the lower unit seemed to be leaking a little oil. Is this something I can fix myself or should I take it back to the dealer?