Leave your morals here.
As an example of what I'm asking, I'll draw a comparison from the world of mobile phones - if you have a month left on your iphone warranty you take it back to your operator and say "oh the screen flickers after an hour or two of usage" and they send it away for you. 9 times out of ten you get a refurb which is next to new. Result.
I don't want a nearly new car, but my warranty is due to end soon, so what sort of thing could I complain about and get replaced at no cost which would save me a bother in a years time?