How should I check a used car for rust in Minnesota?

Look underneath, not at the paint. On a Minnesota car the damage starts where salt spray collects and never dries: rocker panels, wheel arches, the rear subframe, brake and fuel lines, and the exhaust. Surface rust on a 12-year-old car here is normal. Flaking that leaves scale in your hand, or a soft spot in a frame rail or brake line, is the thing worth walking away from.

Why Minnesota is harder on cars than the mileage suggests

Salt and brine keep working long after the road is clear. Slush packs into seams and cavities, stays wet for days in a heated garage, and corrodes from the inside out. That is why a clean-looking 100,000-mile car from here can be structurally worse than a 150,000-mile car from a dry state — and why mileage on its own tells you less in Minnesota than almost anywhere else.

Where to actually look

• Rocker panels and the bottoms of the doors. Press with your thumb. It should feel like metal, not like a crisp.
• Wheel arches, especially the rear. Bubbling under the paint means the rust is already through from behind.
• Brake and fuel lines. Run along them. Scale and flaking here is a safety item, not a cosmetic one, and it is a common Minnesota failure.
• Subframe and frame rails. Surface scale is expected. Holes, soft spots, or anything crumbling is a different conversation.
• Exhaust and heat shields. Rattles here are cheap to fix and tell you how the car was stored.
• Strut towers and the spare-tire well. Lift the trunk mat. Water sits there and nobody looks.

Normal versus a problem

Nearly every used car in this state has rust somewhere. A dealer who tells you a 10-year-old Minnesota car has none is either not looking or not telling you. What matters is whether it is surface corrosion on a panel or structural loss on something that holds the car together or stops it.

What we do before a car goes on the lot

We get underneath every car and we write down what we find, including the rust. Where a car has a published inspection report you will see it on that car's page, with tire tread and brake measurements and a list of what we checked and what we fixed. If a car has corrosion worth knowing about, it goes in the description rather than being left for you to discover on a hoist.

Still get your own inspection

We mean this. Our cars are sold as-is and a pre-purchase inspection by your own mechanic is the cheapest insurance available on a used car. We will hold a car while you arrange one.

Questions about a specific car on our lot? Call (651) 739-9326 or browse what we have.