there isnt a second rubber seal. good idea though. one thing i forgot to mention earlier is that after i first noticed the oil gushing out i checked the oil level to see how much had leaked out. when i pulled the dipstick it had black sticky oil film and dirt particles on it. the oil has always stayed clean before. i assume the particles are dirt because it doesnt stick to a magnet. is it possible this substance has plugged a hole just past the filter? if so, how do i check it or clean it?