Keeping an older commuter car on the road is usually cheaper than buying a new one, but suspension work like struts and shocks will eventually hit your wallet. These repairs are essential for how the car handles, and you shouldn't put them off once the ride gets bouncy or stiff.
You can often save on the $1250 typical cost by calling independent suspension shops on a Tuesday or Wednesday when they have fewer appointments. Ask for their best labor rate since mid-week is often their slowest time.
Remember that the 0% intro APR is a temporary window, not free money. If you have a balance left when the 15 months are up, you will be charged interest on whatever remains, which can add up fast.