Replying to How can I convince my dad to let me buy this car.

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First off, I want to buy this 1991 Mk2 GTI that this guy is selling. It is in MINT shape to say the least. It has 92k miles on it. We just got home from checking out the car and we drove it around. The owner has done a lot to this car and one thing is a VERY stiff suspension. He seems to be stuck on the fact that it'll handle like shit in the winter (which I know it will, but only on the shitty roads), and that I'll get sick of bouncing over every bump (LOTS of these in Maine). From what I can tell he seems sort of 50/50 on it. I am in love with this car and I've always wanted a mk2 gti. I've had a few friends that have had these and that's really what made me want one; they're just so fun. Basically I'm stumped on how to get him 100 percent convinced to let me get this car. After all, he's the one fronting me most of the money for it. He knows I'll pay him off in a quick manner so that's not the issue.

Sparknotes: I want this car that my dad thinks I will hate in a few months. Which I may but it's too fun of a car to care. How can I convince him to help me buy it.