This doesn't cover everything. Not sure about the car loan documentation (I don't think there are any tax advantages) but you can get rid of it for sure when you sell the car and all records of your ownership are cleared with your DMV.
If nothing else you can put everything for one year in a clasp envelope and forget about it if you're paranoid about throwing something important away.
One time I shredded my receipts and then realized that I still had quite a bit of allotment left on my health flexible spending account. I had just shredded my records of all my OTC medicines, which could be bought with the allotment. So I'm a tad shred-shy now.