What does "per diem" mean on a car loan?

I’m venturing out West on my motorcycle for the first time. While I really want to hit Colorado and New Mexico, I’m going to spend a bit of time in Nevada. I’m fairly certain that motorcycle laws outlaw lane splitting, but I’d really like to do it if possible. Does Nevada allow lane splitting?

Is it legal for the dealership said to ask me to come back in and resign on my new car and change my monthly payments. I put a large down payment on the car to keep my payments under $100 per month, but the dealer said this was too large an amount. What are my options?

I just noticed on my statement that my car loan principal increased by $3,300, and all it says is "principal disbursement" next to the figure. What does this mean?