I'm guessing some players don't like anything over the usual 78mins of audio. Even if the pc can burn it, it might create errors if your pc drive can't cope properly, or maybe the car stereo.
I've got a stereo in the car which can play mp3 cds (basically a data cd full of mp3s). It's probably around 8 years old now and is starting to skip & go a bit funny, so if you were to get something else, I'd probably recommend something with a usb port - that way u could put loads of stuff on a usb stick

Just don't buy those tiny little usb sticks - I got one & it's broken already..
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