Should you fix your sick car? Or move on?

You’re looking at a $1,200 repair estimate for your ailing car when an ad catches your eye: a brand new set of wheels for a mere $450 a month.

At first, dumping your old car might seem like a no-brainer — and you can’t help picturing how good you would look in that new car. But automotive experts say you’ll almost always come out ahead — at least financially — by fixing old faithful. There are, however, other important considerations when deciding whether it’s time to say farewell.

Cost of buying new

“Even though the repair cost might hurt, you really have to think about buying a new car as a tremendously more expensive proposition,” says Jim Manelis, head of direct lending for Chase Auto Finance.

At the very least, for a reliable used car, expect to spend a minimum of $2,000, plus tax and registration fees, says Mark Holthoff, editor at Klipnik.com, a community website for used car enthusiasts. Depending on the severity of your car’s problems, “You can buy a lot of repairs for that kind of money,” Holthoff says.

Of course, there does come a point when it isn’t worth pouring money into a beater.

The breaking point

“Start with the scale of the repair,” Manelis says. “Is it a $1,200 fix or is it a $5,000 fix?” Then, look up the current value of your car using an online pricing guide like Kelley Blue Book.

When repair costs start to exceed the vehicle’s value or one year’s worth of monthly payments on a replacement, it’s time to break up with your car, according to automotive site Edmunds and Consumer Reports, the product review site. As an example, say you’ve already spent $1,500 on repairs and now need a new engine for $3,500, and instead you could get a new or more reliable used car for $400 a month ($4,800 a year).

Beyond repair costs, Consumer Reports says to factor into your decision the savings from a new car with better fuel efficiency and the new car’s loss in value over time. Manelis also suggests thinking about your current car after repairs. Once it’s fixed up, what will it be worth and how long will it continue to run reliably?

To help answer the question of fixing a car or buying a new one, do a cost-per-mile comparison with the “Fix-it or Trade-it” calculator created by the Automatic Transmission Rebuilders Association.

However, Ron Montoya, senior consumer advice editor at Edmunds, says there’s another equally important consideration: peace of mind. “If breakdowns become frequent and you feel unsafe on the road, that’s the

time to replace it.”

If you decide to fix up

“It’s imperative to have a mechanic that you trust” before you move forward with any repairs, Holthoff says. For example, the service department at a dealership might be more interested in frightening you with repair bills to get you to buy a new car.

Once the car is purring again, Holthoff says to continue driving it long enough to make up for the cost of the repairs. Later, if you decide to sell, you can do so with confidence.

If you decide to break up

Even if you decide to part ways with your car, you’ll have to get it running again or sell it as-is for less money. If you can, make the repairs, then repay yourself after you sell the car.

“Honesty is the best policy,” Manelis says about selling a car with issues.