Every autumn, the same pattern repeats: as soon as the first hard frost hits, the number of tow truck and roadside assistance calls jumps sharply. In most cases, the issue isn't really a "breakdown." It's that the car simply wasn't prepared for the season in advance. Here's a checklist worth going through before the cold arrives. It takes one evening, but it can save you from a much worse morning stranded somewhere on the highway.

The battery: winter's biggest question mark

Battery capacity drops in cold weather: that's basic chemistry, not a battery defect. A battery that was still cranking the starter confidently in autumn might already struggle at -15°C, more so if it's more than 3 to 4 years old.

  • Check the manufacture date and age of the battery: if it's older than 4 to 5 years, it's worth having it load-tested at a shop rather than just eyeballing it;
  • Check the electrolyte density if it's a serviceable battery;
  • Inspect the terminals for corrosion: poor contact becomes especially noticeable in winter;
  • If the car is parked outside rather than in a garage and your trips are short, the battery may not be getting a full charge from the alternator. Worth keeping in mind.
Important: if the battery has already died once this fall for no obvious reason (lights left on, etc.), don't wait until winter to deal with it. Replacing the battery ahead of time is far cheaper than a tow truck call at -20°C.

Tires and pressure

Switching to winter tires is the basic step everyone knows about, but there are details that often get overlooked:

  • Tread depth. For winter tires, the critical minimum is 4mm. With more worn tread, grip on snow and ice drops sharply;
  • Tire pressure needs to be checked more often. It drops as temperatures fall (roughly 0.1 atm for every 10°C), and underinflated tires noticeably hurt handling on snow and ice;
  • Don't mix different tire types on the same axle: this affects vehicle stability during emergency braking;
  • Check your spare tire's condition too, it needs to be ready for the season as well.

Oil, coolant, and washer fluid

Fluids behave differently in the cold, so it's worth paying closer attention to them before winter:

  • Engine oil. If you use seasonal oil, now's the time to switch to a winter or all-season viscosity: summer oil thickens in the cold and puts extra strain on the starter during a cold start;
  • Coolant. Check the freeze point of your coolant: it should be rated with a margin for the coldest temperatures your region actually gets, not just an "average" winter;
  • Windshield washer fluid. Make sure you switch from summer to winter-grade fluid. Frozen fluid in the reservoir and lines can damage the washer pump itself.

Body, glass, and door seals

Small things that rarely come to mind ahead of time but cause real headaches in winter:

  • Treat rubber door seals with silicone lubricant: this prevents them from freezing shut;
  • Check your wiper blades: summer blades handle snow and ice poorly, so switch to winter ones;
  • Make sure all drainage points and channels on the body aren't clogged with leaves, otherwise meltwater can freeze and cause problems;
  • Test your rear window defroster and windshield defroster, if equipped. These are especially valuable in winter.

Cabin and electrical systems

  • Test your heater in advance, not on the first freezing day;
  • Make sure the battery is securely mounted. It takes more strain in winter, and a poorly secured battery fails faster from vibration;
  • Check the glow plugs if you drive a diesel: their wear is especially noticeable during cold starts;
  • Make sure you're using winter-grade diesel fuel in severe cold. Summer diesel starts gelling at around -5 to -10°C.

What's worth keeping in the car over winter

A small kit in the trunk can make a big difference if you hit a sudden breakdown or get stuck:

  • Jumper cables or a compact jump-start pack;
  • An ice scraper and snow brush;
  • A small shovel, useful for trips outside the city;
  • A warm blanket and some water if you're planning longer highway trips;
  • A reflective vest and a warning triangle, useful year-round, but visibility is worse in winter, making these even more important.

Bottom line

Winter prep isn't a one-time task. It's a set of small checks, each of which reduces the risk of getting stuck in the cold with a car that won't cooperate. And if something still goes wrong despite the prep, a frozen lock, a dead battery, a car that won't start in the cold, call us: we work around the clock in any weather, including severe frost and snowstorms.

Frequently Asked Questions

When's the best time to switch from summer to winter tires?

A good rule of thumb is a consistent average daily temperature around +7°C. Below that, summer tires lose flexibility and grip worse, even on dry pavement.

Does the battery need extra insulation in winter?

In most cases, for passenger cars in our climate, this isn't necessary if the battery is healthy and under 4–5 years old. A thermal cover can help if you regularly drive in severe cold or have an older battery.

Can I just top off summer oil with winter oil instead of a full change?

No, different viscosity oils should be fully replaced, not topped off on top of each other. Mixing can unpredictably alter the lubricant's properties.

How do I know it's time to replace the coolant before winter?

A shop can check the freeze point with a hydrometer in a few minutes. If the protection threshold is above -25 to -30°C, it's worth considering a replacement for our climate.

What should I do if a door is frozen shut?

Don't yank the handle: you could damage the seal. Gently pour warm (not hot) water over the frozen area, or use a lock de-icer if you have one on hand.

Should I warm up the engine before driving in winter?

Modern fuel-injected engines don't need a long warm-up while parked. Usually 30 to 60 seconds is enough, after which you can drive gently and let the engine warm up on the move.