A car that hasn't moved in weeks or months doesn't announce its problems — they show up quietly, and usually all at once the first time you try to drive it again. Knowing what to look for, and why each sign happens, makes it much easier to catch a problem before it becomes an expensive one.
1. A rhythmic thump or vibration when you first drive off
This is flat-spotting, and it's the most common issue with a stored car. The tyre's compound has taken a temporary — or in severe cases, permanent — set from bearing the vehicle's weight on one static contact point for an extended period. If the vibration fades within 10–15 minutes of driving, it's likely temporary and nothing to worry about. If it persists or worsens, the tyre may have taken a permanent set and is worth having inspected. The underlying cause is almost always the same: weight resting on a flat surface for too long. Tyre cushions address this directly by spreading contact across a larger surface area instead of a single flat point.
2. A battery that won't hold a charge
Batteries self-discharge even when a car isn't running, and modern cars with always-on electronics — alarms, immobilisers, infotainment memory — drain faster than older vehicles. A battery left completely alone for more than a few weeks is a common reason a stored car won't start. A smart battery maintainer, rather than simple disconnection, is the more reliable fix.
3. Cracking or discolouration on tyre sidewalls
UV exposure and ozone in the air slowly dry out the oils that keep rubber flexible. This shows up first as fine surface cracking on the sidewall, especially on cars stored outdoors or in direct sun. It's a sign the tyre has been exposed to more UV and heat than ideal, and while minor cracking isn't necessarily dangerous, it's worth a professional check before extended driving, and a sign to reconsider storage conditions going forward.
4. A musty smell or visible moisture inside the cabin
Cars sealed up for long periods without any airflow can develop condensation, especially in humid climates or when temperature swings between day and night. Left unaddressed this can lead to mildew on upholstery and, in worse cases, electrical issues. Cracking a window slightly or using a moisture absorber in the cabin during storage prevents this.
5. Uneven or accelerated tyre wear once you're back on the road
If a car has been flat-spotted repeatedly over multiple storage periods, the tyre's internal structure can wear unevenly even after the visible flat spot disappears, since the belts underneath may have taken a lasting set. This shows up as vibration that returns at certain speeds, or tread wearing faster on one section of the tyre than the rest. This is the cumulative version of sign #1 — repeated flat-spotting without any preventive measure eventually causes real, permanent tyre damage rather than just a temporary inconvenience.
The common thread
Four of these five signs trace back to two root causes: static weight sitting on a flat surface, and a lack of active maintenance during storage. Addressing tyre contact pressure with cushions, maintaining the battery actively rather than passively, and giving the car some airflow and shade go a long way toward making sure the next time you start it, it starts the way you left it.