Finally, I have read this one. It's a great book. It almost completely follows the movie, but there is a major difference. While the events are basically the same, the story behind it is altered significantly. I was a bit peeved about Dennis and Leigh, and it was odd with King's point of view. For the first 200 pages or so, he told the story through first-person (Dennis, the friend). Suddenly, he switches to multiple viewpoints until page 350 or so. Then he stays in first person, Dennis only, for the rest of the book. So strange! The very end was well done, and I wish it wasn't over in a way. There's a nifty ensemble of characters, a quick pace, a unique story with various ups and downs, and a sad, bittersweet touch. The main focus is triangles - Arnie, Dennis, and Leigh --- and Arnie, Lebay, and Christine.
Now, the below is my rambling on why I think the book is changed from the movie. In the book, it was Lebay who made Christine alive and was the real power rather than it being an evil powerful car by itself. It's filled with spoilers, so don't read if you haven't read the book.
I just read it and finished it for the first time tonight. I thoroughly enjoyed it and put up a short review. I agree the character of Arnie was sad and he was very likable. I'm also confused about the possession. It seems to me that LeBay made Christine alive somehow rather than how the movie shows it. When the brother is telling Dennis during their first conversation about his brother's obsession with the car, he mentions that Lebay was always hunting for a car and then finally ordered one and had custom things done to it like the paint job. This would indicate to me that he ordered that style of car in the way he wanted, but that he never saw it in person prior, right? So either the car was a normal car and it was supernaturally brought to life with their link, or else the car he just happened to pick was Christine, already inhabited. However, if the second is the truth -- then why would Christine let herself sit in a bodyshop or dealer? And, if she always liked to keep everything the same with her stubborn personality, why did she allow herself to be custom painted and keep that paint? This is what's been nagging me about Christine being alive herself from the start. Additionally, instead of making it about Christine - once LeBay was revealed, it seemed mainly about him for the duration of the book, in control of Christine basically. It would seem because of that that he is the driving force. Even the very end of the book now ends with "His undying fury", rather than hers. King changed it as readers learned more and read further. The other thing I think of is if Christine was alive and changed people's lives and absorbed them, so to speak, then why would she merge LeBray and Arnie? Why would she not leave him as he is and slowly change him into another version of himself? If she just changes people and gets them addicted to her, that would explain Lebray, but it wouldn't explain Arnie merging with Lebray until Lebray was the main driving lifeforce behind the car. Otherwise, a previous owner would also have been merged in Lebray, I think. And it's made clear with backstory that Lebray was always an evil sort of man, way before he met Christine. The last hang-up I have is, why did the car deteriorate so bad under Lebrays watch? I guess it did not have as much power or restoration before being purchased by Arnie? Dennis seems to start finding that out at the end. So, again, that would mean previously Christine - before Arnie and Lebay merged, did not have as much power by itself? And that the merging of the two would make the car as alive as it was, which would again indicate they were the only owners ever of Christine....thus meaning it was Lebray again rather than Christine possessing him at first.