Long-term car storage is not the same as parking for a long weekend — putting a collector car away for a season takes preparation. Left unprepared for three months or more, gasoline oxidizes, acids accumulate in old engine oil, tires develop flat spots, batteries discharge, and rodents move in. The good news: proper layup is a half-day job with a short shopping list. Here is the complete checklist, in the order you should work through it.
Step 1: Wash, Detail, and Protect the Paint
Never store a dirty car. Bird droppings, bug splatter, brake dust, and road film are mildly acidic or abrasive, and months of contact will etch clear coat and pit brightwork. Before layup:
- Wash and fully dry the car, including door jambs, sills, and wheel barrels. Trapped moisture under trim is how corrosion starts.
- Clay the paint if it has not been decontaminated recently, then apply a quality wax or sealant. A sealant typically protects for 4–6 months, which matches most storage terms.
- Clean and dress the leather. Conditioned hides resist drying and cracking in low-humidity storage environments — a real concern in desert markets like Las Vegas, where ambient humidity can sit below 20 percent.
- Vacuum the interior completely and remove every trace of food. Even a stray french fry under a seat is a rodent invitation.
Step 2: Fuel — Fill the Tank and Stabilize It
Owners debate two approaches: store the car with a nearly empty tank, or fill it and add stabilizer. For the overwhelming majority of cars, full tank plus stabilizer is the correct answer. A full tank leaves minimal air space, which means minimal condensation inside the tank and less oxygen available to degrade the fuel. Untreated pump gasoline, especially E10, begins to oxidize and lose volatility in as little as 30–60 days; ethanol also absorbs water and can cause phase separation in a partially empty tank.
- Buy ethanol-free fuel if it is available in your area; if not, top-tier 91–93 octane E10 with stabilizer is fine.
- Dose a quality fuel stabilizer at the label rate — commonly around 1 ounce per 2.5 gallons of fuel, so roughly 8–10 ounces for a typical 21–26 gallon exotic tank. Most stabilizers keep fuel fresh for 12–24 months.
- Add the stabilizer before your final fill-up, then drive 5–15 minutes so treated fuel circulates through the pump, rails, and injectors.
The near-empty approach only makes sense for carbureted race cars that will have their fuel systems drained completely — a half-measure empty tank is the worst of both worlds.
Step 3: Change the Oil Before Storage, Not After
Used engine oil holds combustion byproducts — moisture, unburned fuel, and acidic compounds — that slowly attack bearings and seals while the car sits. A good rule of thumb: change the oil and filter within a couple of weeks of layup, then run the engine to operating temperature once so fresh oil coats internal surfaces. Storing on old oil is the most common prep mistake, and the cheapest to avoid.
Check the Other Fluids While You Are Under There
- Coolant: verify concentration with a refractometer or test strips; a 50/50 mix protects to roughly –34°F and inhibits corrosion. Replace coolant that is beyond its service interval (typically 2–5 years depending on formulation).
- Brake fluid: DOT 3/4 fluid is hygroscopic and should be flushed every 2–3 years. Fluid at around 3 percent water content is due for replacement (that's the industry threshold where its boiling point has degraded), and moisture-laden fluid corrodes calipers and ABS components from the inside — storage accelerates nothing, but it gives corrosion uninterrupted time to work.
- Top off washer fluid and check for any weeping from hoses, the water pump, or shock seals so leaks do not surprise you in the spring.
Step 4: Battery — Tender, Don't Disconnect
Modern exotics do not tolerate battery disconnection well. Pulling the negative terminal can dump seat, window, transmission-adaptation, and alarm settings, and some cars may require dealer-level tools to fully re-initialize. The better solution is a smart battery maintainer (tender) in the 1–2 amp class — not an old-style trickle charger, which charges continuously and can overcharge and dry out a battery over months. A proper maintainer floats the battery at roughly 13.2–13.4 volts and cycles on only as needed. For AGM and lithium batteries (common in late-model Porsches, Ferraris, and McLarens), confirm the maintainer has the correct mode; charging a lithium starter battery on a lead-acid profile can damage it. Disconnection remains a reasonable fallback only for older analog cars with no tender access and minimal electronics.
Step 5: Tires — Beat Flat Spots Before They Form
A stationary tire develops a flat spot where the contact patch sits. Nylon-belted and high-performance summer tires are especially prone, and while many flat spots work out after 20–30 minutes of driving, spots formed over a full winter at low pressure can become permanent. Your options, from simplest to best:
- Add a small bump of 2–5 psi (Hagerty’s guidance — tire makers like Michelin say placard pressure is fine; never exceed the sidewall maximum) above the placard pressure (e.g., 32 psi placard → 42 psi, staying well under the sidewall maximum). This stiffens the carcass and reduces deflection. Reset pressures before the first drive.
- Tire cradles or curved storage pads, which spread the contact patch over a larger arc. This is the best solution for storage beyond 6 months and for low-profile tires.
- Periodic movement — rolling the car a quarter tire-rotation every 2–4 weeks — if someone has regular access to the car.
Jack stands under a modern exotic are generally discouraged for long-term storage; suspensions are designed to sit loaded, and hanging control arms for months stresses bushings and ball joints.
Step 6: Rodent Prevention
Rodent damage is the most expensive surprise in car storage — a chewed harness on an exotic can run into five figures (the popular theory that soy-based insulation attracts rodents is unproven — they chew wiring of every kind). Block the intake and exhaust openings with stainless-steel wool or purpose-made plugs (tag the steering wheel with a reminder note), keep the storage space free of food and cardboard, and place snap traps around the car (never poison bait — a poisoned rodent dies somewhere inside the car). Peppermint-oil deterrents help at the margins but are no substitute for exclusion and traps. A sealed, professionally pest-managed building beats any DIY garage measure.
Step 7: Choose the Right Cover
Indoors, use a breathable, soft-lined indoor cover — ideally a custom-fit one. Never use a waterproof or plastic-backed cover inside: it traps migrating moisture against the paint and can imprint or blister finishes. Breathability matters even in climate control, and doubly so in humid markets like Palm Beach, where a non-breathable cover can hold condensation against chrome and paint for weeks. Make sure the car is completely dry before covering it.
DIY Garage vs. a Verified Storage Facility
Everything above is achievable at home. What a professional facility adds is the environment and the discipline of a routine you do not have to remember. Here is how the two compare on the items that matter most:
| Task | DIY Garage | Quality Facility |
|---|---|---|
| Climate control | Rarely; garages swing with the seasons | Typically 55–70°F, 40–50% relative humidity |
| Battery maintenance | Your tender, your memory | Maintainers on every car, checked on a schedule |
| Tire care | Overinflation, maybe cradles | Cradles and/or scheduled repositioning |
| Pest control | Traps and steel wool | Sealed building with professional pest management |
| Periodic exercise | Only if you visit | Startup/drive programs at many facilities |
| Security | Home alarm | Monitored cameras, controlled access, fire suppression |
Not every building that calls itself a car storage facility actually delivers these things, which is why we inspect for climate control, security, and maintenance practices before listing anyone — you can read exactly what we check in our verification standards. And if you are weighing the monthly expense against the cost of DIY mistakes, our breakdown of what exotic car storage costs covers typical pricing tiers by market and service level.
The Monthly Checklist While Stored
Whether the car sits in your garage or a facility handles it under a care plan, someone should do the following every 4–6 weeks:
- Confirm the battery maintainer shows a float/maintained status, not a fault light.
- Check tire pressures and look for slow leaks.
- Inspect under the car for new fluid spots.
- Look for any sign of rodent activity: droppings, nesting material, chewed insulation.
- Lift the cover and inspect the paint for moisture or contact marks.
- If the car will be exercised: run it to full operating temperature and, ideally, drive it 15–20 minutes — brief idling without reaching temperature does more harm than good because it loads the oil with condensation and fuel.
Ready for the Season
Work through this list once and layup becomes routine: clean and sealed, full stabilized tank, fresh oil, tender connected, tires protected, openings blocked, breathable cover on. If you would rather hand the monthly discipline to professionals — or you simply do not have climate-controlled space at home — storage markets from Dallas to Atlanta have dedicated collector-car facilities that handle all of it. Browse our city index to find verified facilities near you, each one inspected against the same standards before it earns a listing.