Dear Abby,

 I've never written to you before but I really need your advice on what could well be a crucial decision. I've suspected for some time now that my wife has been cheating on me.

 The usual signs ... phone rings but if I answer, the caller hangs up - My wife has been going out with the girls a lot lately but if I ask their names it's always "just some of the girls from work, you wouldn't know them."- I always stay awake to look out for her taxi when she gets home but she always walks up the drive.

 I have never approached the subject with my wife, I think deep down I just didn't want to know the truth. Last night she went out again and I decided to really check on her. I decided to park my BMW R1150 GS motorcycle 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, crouched down behind the bike, that I noticed that the valve covers on the engine seemed to be leaking a little oil.

 Is this something that I could fix myself or should I take it back to the dealer?