Is it rude to negotiate a car price?

No. Negotiating is a normal part of buying from most car dealers, and salespeople expect it. Staying polite, factual and specific keeps it comfortable for both sides. Base your number on research, explain it briefly, and listen to their response. If the seller has a fixed-price policy, they'll tell you. OffLot is designed to let you research prices and make an offer online without sales pressure.