there was a debate awhile back as to whether it is an "oil slinger" (what everybody refers to it as) or if it is to help protect the front of the eng from oil leaks out the front which would inundate Ma with dealer comebacks. seal quality is light years better than way back so what Stump said, you'll be fine (assuming correct seal installation) but if you have one I would use it (& NAPA wont have it). I can get one to your front door for a ten dollar bill. that way you know you are "correct". You'll sleep better at night (as will I!).