Owning a car is mostly fine until maintenance sneaks up on you. Tires are one of those recurring expenses where timing makes a huge difference. Spring and fall are when prices soften up, thanks to major manufacturer rebate seasons in April and October.
A solid set of four all-season passenger tires usually sets you back about $650 out the door. If you time the purchase right and spread out the cost, you can protect your monthly budget without putting off vital safety upgrades.
A 0% intro APR window is a tool to stretch your cash flow, not free money. If you still carry a balance after the 15 months end, the remaining amount gets hit with the standard variable APR, which will quickly erase any savings you got from buying on sale.