I have an 83 original owner with 65K ,miles. I have only driven mine in winter a few times -not by choice. I always thought the undercoating of my 83 was impressive. I opted out of any aftermarket undercoating because the dealer told me the body had a 7 yr guarantee against rust, which was better than most cars at that time, So here is a pic taken 10 years ago of my car - I was having the trans re-built.
I do wash the underside, wheel wells, etc of my car every year just because.
