i have a 1995 monte carlo z34 and i recently looked at all my spark plugs before i replace them in a week. they all had oil on them but if you wipe the oil off they look brand new... what can this mean? and i have a problem with my exhaust smelling like gas bad. could that be the O2 sensor?

 

have you jacked the car up recently? if so all the oil could have went to one side of the engine and maybe leaked through some gaskets and on to your spark plugs

 

How many miles? I'm going to say fried rings and excessive blowby. If not check to make sure your PCV system isn't clogged up. If you take your oil neck off is there a lot of smoke coming out of it? Also with the engine running take the dipstick out and hold your thumb over the tube and see if you can hear a difference.