Interesting concept. How much money does it cost relative to the price of the car?
I typically don't prepay for services and goods, such as oil changes or tires, since so many things can change in your life that could make that a throw away piece of paper. If in year two the car gets totaled, or you decide you need a minivan for an unexpected triplet birth, or you lose your job and have to downsize, or whatever...you still pay for the agreement, but can't use it.
If it cost 10% or more of the car, I'd just avoid it. 1% of the car, I would do it. Between those percentages, I would just have to read my horoscope and see what it told me to do.
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