I only bought my car this past July, have done two oil changes myself when it was nicer out. Now that it is friggin cold, I took it to a shop to do it and now I seem to be leaking oil out from around the bolt underneath.

My question: is that bolt supposed to have a washer on it? I cannot recall the last two time I did it if it had one or not, I cannot see one on there now. Maybe the dumbass at the shop didn't tighten the bolt enough and now it's leaking.

Anyone have any thoughts on this? Thanks