When to stop fixing an old car

Every shop has an incentive to do the repair. We sell used cars too, which means we have an incentive both ways, so take this for what it's worth — but here's genuinely how we'd think about it.

The wrong question

Most people ask "is this repair worth more than the car?" That's the wrong comparison, because it assumes the alternative is free. It isn't. The alternative is another vehicle, with its own price, its own unknowns, and its own first-year repairs.

The better question

What does the next twelve months cost, either way?

Say you're looking at $1,800 of work on a car worth $3,000. That sounds terrible. But if the rest of the car is sound — decent tyres, no rust, transmission shifts properly, no oil leaks — then $1,800 buys you a year or more of driving in a vehicle you already know.

Replacing it costs you $8,000 to $12,000 for something reasonable, plus tax and title, plus whatever it needs in the first six months, plus the risk that you've bought someone else's problem.

Now the $1,800 looks different.

When we'd say stop

The signals that change our answer:

• It's the second or third major repair in a year. One big bill is bad luck. Three is a pattern, and the pattern usually continues.
• Structural rust. Frame or subframe corrosion isn't economically repairable, and it's a safety issue rather than an inconvenience.
• Engine and transmission both need work. Either one alone can be worth doing. Both at once rarely is.
• You've lost confidence in it. This one's real. If you won't drive it to Seattle because you don't trust it, you've already stopped getting full value from it, whatever the mechanical condition.

When we'd say fix it

• One expensive system, everything else sound.
• You know the car's history — ideally because you've had it serviced properly.
• The repair has a defined end. A timing belt and water pump is a known job with a known outcome. "Chase an intermittent electrical fault indefinitely" is not.
• Replacing it means taking on a payment you'd rather not have.

What we'll actually do

Give you the real number, tell you honestly what else we found that's likely to come up in the next year, and say what we'd do if it were ours.

Sometimes that answer is that the money's better spent on a different car. We happen to sell those, which means we can have both halves of that conversation in one place instead of sending you elsewhere for the second half. It also means you should weigh our opinion accordingly — so ask us to show you what we found, and we will.