at the end of the day its a skyline, its not some uber mega rare museum piece. They're meant to be driven, and they're engineered to be regular road going cars. You don't have to worry about its health if you maintain them well and service them regularly. I did about 120km/day in my old line and when I sold it, it ran as well as it did when I got it. If you can't afford the upkeep, you shouldn't have bought the car in the first place, but if you can afford it, then drive it till the wheels fall off, which if done right, will never happen.