Why store a car on blocks?

[Melo]

Lifting a car onto blocks or jack stands for long-term storage directly prevents costly damage: it avoids permanent tire flat spots, relieves constant stress on suspension springs and bushings, and stops brake pads from seizing to rotors. For storage exceeding one month, this method is a standard professional recommendation to preserve the vehicle's mechanical and structural integrity.

The primary reason is to prevent tire deformation. When a vehicle sits stationary, the weight concentrated on a small tire contact patch can cause the rubber compounds to harden and lose shape, creating flat spots. Industry data from tire manufacturers like Michelin indicates that flat-spotting can begin to become permanent after continuous parking for as little as 30 days, leading to severe vibration when driven. Placing the car on supports removes this constant pressure, allowing the tires to retain their round profile.

Equally critical is relieving the suspension system. Coil springs and struts are designed for dynamic compression and rebound, not static load. Keeping them fully compressed for months can accelerate fatigue in the metal and cause the rubber bushings to take a "set," degrading ride quality and handling. Supporting the frame or designated lift points allows the suspension to hang at or near its natural ride height, preserving component life.

Moisture and temperature are significant threats. Concrete garage floors can wick moisture, promoting tire sidewall rot and wheel corrosion. Lifting the car creates an air gap, improving circulation and reducing these risks. For the braking system, it enables the parking brake to be fully released. If engaged, brake pads can fuse to the rotors through corrosion (a process often called "rust welding"), requiring forceful and potentially damaging separation later.

Safety is paramount when supporting a vehicle. Always use professionally rated jack stands or solid, purpose-built automotive blocks placed at the manufacturer-specified lift points, typically on the frame rails or designated control arm areas. Cinder blocks or improvised wood stacks are unsafe as they can crumble or shift. Before working, apply wheel chocks to the wheels still on the ground. For those unable to lift the entire vehicle, an alternative is to over-inflate tires to the maximum PSI indicated on the sidewall, which can mitigate but not eliminate flat-spot risk. The consensus among preservation experts for optimal multi-month storage is full support, supplemented by a battery tender and fuel stabilizer.

[ZacharyAnn]

As a mechanic for over twenty years, I’ve seen the results of improper storage. A customer once brought in a classic Mustang that sat for two years on its tires. The vibration was so bad you couldn’t drive over 30 mph—all four tires were squared off. We had to replace them, and the rear leaf springs had taken a permanent sag. Now, I always tell folks: if you’re parking it for the season, get it on stands. It takes an hour and saves you thousands. Support it under the solid frame points, release the handbrake, and you’re giving that car a real fighting chance against time.

[GrahamRose]

Let’s break it down simply. Your car is a collection of parts under tension. Tires want to be round, springs want to bounce, brakes want to move. Parking for months fights all that. The pressure point on the tire flattens it. The compressed spring gets tired. The brake pad sticks fast to the rotor. Lifting the car on blocks solves all three. It’s like taking the weight off your feet after a long day—everything gets to relax. Just make sure you’re using proper jack stands on a level surface. Think of it as putting the car to bed properly, not just letting it collapse on the floor.

[SanPaislee]

I own a 1970s Porsche that I only drive in summer. Storing it on blocks isn’t optional; it’s essential maintenance. The cost of a set of high-performance tires or rebuilding the torsion bar suspension far outweighs the minor hassle of setting up stands. My process: I drive it onto planks for clearance, use a quality floor jack on the central lift point, and position four jack stands securely. I then gently lower the car until its weight is fully on the stands, giving the tires a slight wiggle to confirm they’re free. The steering feels light and precise every spring when I reverse this process—no flat-spot shimmy, no seized brakes. It’s the peace of mind that comes from knowing the car is preserved in a state of rest, not decay.

[Rhonda]

From a pure materials science perspective, long-term static load is detrimental. Rubber undergoes creep and compression set. Steel springs experience stress relaxation. Storing on blocks interrupts these processes. For the enthusiast, the key is understanding where to place the supports. Modern unibody vehicles have specific reinforced jacking points, often marked along the sill. For body-on-frame vehicles, the sturdy frame rails are ideal. Avoid placing force on oil pans, differentials, or suspension arms not designed for it. The goal is to simulate the car’s weight being supported by its wheels, but without the wheel contact. This approach maintains proper geometry for bushings and keeps drivetrain components, like constant velocity joints, in a neutral position. Combine this with a climate-controlled environment if possible, as consistent temperature further slows the aging of rubber and protects against condensation on critical metal surfaces.