Cars cost way more than their sticker price. Between gas, insurance, and routine maintenance, keeping your ride running and clean takes real money, but late fall is usually when local detailers offer soft pricing before winter sets in. Negotiate your service price up front before you think about financing, as a zero-interest card window is meant for maintenance and extras, not buying the car itself.
A solid $250 interior deep clean strips out summer grit and preps your cabin for wet winter weather. Spreading that cost out over time keeps your cash liquid while your car stays protected.
Keep in mind that an intro window is a deadline, not free money. If you still have a balance on your Citi Simplicity® Credit Card after 18 months, regular interest applies to whatever remains, so clear the full balance before the window closes.