Where is Janis Joplin's Porsche now?

I’ve always wanted to buy a luxury car, but I also want to buy American. That limits my options, but Cadillac is at the top of my list. I want to find out if a pre-owned or new Cadillac is the better option. How much do Cadillacs depreciate?

I’m buying a new battery for my 2014 Honda Accord for the first time. Just to be safe, I want to get the battery that it comes with—that way I’ll know it’s a good fit. What’s the OEM battery for the 2014 Accord?

My uncle restores old cars as a hobby, and he always talks about checking the timing belt on the old engines. I drive a modern A4; is this something I should check? How often should the timing belt be replaced on an Audi A4?