With heatwaves becoming more frequent across the UK and Europe, it’s not just you who needs to stay cool — your engine does too. Extreme temperatures can put your vehicle under serious strain, increasing the risk of breakdowns, overheating, and long-term wear on vital components. Whether you’re cruising through Britain’s backroads this summer or road-tripping through southern Europe, keeping your engine in top condition during hot weather is critical.
As a leading supplier of engine oil and essential car parts, Opie Oils is here to help you prepare your vehicle for soaring temperatures. Here’s everything you need to know about looking after your engine in the heat — including what to do if things go wrong.
Why heat is hard on engines
Engines always generate heat when you’re driving, but when the outside temperature rises, the whole system is under extra pressure. Cooling systems have to work harder, lubricants can thin out, and your car’s internal temperature may creep towards dangerous levels. Without proper care, it can lead to engine overheating, oil degradation, cracked hoses or belts, reduced battery life, and poor fuel economy.
Staying on top of engine maintenance and making small adjustments in hot conditions can help avoid costly damage — and keep you safe on the road.
Engine maintenance dos and don’ts
DO Check your coolant
Coolant is your engine’s best defence against overheating. Make sure the coolant reservoir is topped up with a pre-mixed coolant or the correct mixture of antifreeze and water (usually 50/50), and keep an eye on the level regularly during heatwaves. A sudden drop could indicate a leak or a failing water pump.
DON’T Ignore warning lights
Your dashboard lights are there for a reason. If you see the temperature warning light or notice the needle edging into the red, don’t just hope it’ll go away. Pull over as soon as it’s safe, and let the engine cool before investigating further.
DO Keep an eye on oil levels
Engine oil lubricates moving parts and helps regulate temperature. In hot weather, oil can degrade faster, especially if it’s already old or low in quantity. Regularly check your oil level using the dipstick and top up or change it as needed. Consider using high-temperature-resistant oil if you live somewhere warm.
DON’T Leave it until the last minute
If you’re heading abroad or know a heatwave is coming, don’t wait to check your engine. Do a full fluids check (coolant, oil, brake fluid, and washer fluid), inspect belts and hoses for cracks or bulges, and make sure your air conditioning is working — not just for comfort, but because a cool cabin helps reduce driver fatigue.
DO Listen to your engine
Unusual sounds, sluggish acceleration, or steam from the bonnet are all signs that something isn’t right. The earlier you spot an issue, the more chance you have to prevent a breakdown.
What to do if your engine overheats
Even with good prep, overheating can still happen, especially during long journeys or in heavy traffic. If your temperature gauge spikes or you see steam coming from the bonnet, find a safe spot to pull over and switch off the engine immediately to prevent further damage. Never open the bonnet straight away — wait at least 30 minutes for the engine to cool down before checking anything. If the coolant is low and you have a bottle of pre-mixed coolant, you can carefully top it up. Do this only once the engine is cool to the touch.
If you’re unsure what caused the issue or the warning light doesn’t go off after cooling down, call a breakdown service. Continuing to drive an overheating engine can be extremely dangerous.
Preparing your car for warmer climates
If you’re taking your car on a European road trip this summer, you’ll need to prep for conditions that are hotter than we’re used to here in the UK. Here’s what to do:
- Book a summer service: Many garages offer a summer or holiday health check—ideal before heading abroad. Ask for a check on your cooling system, air con, brakes, and battery.
- Upgrade your oil if needed: Some manufacturers recommend different oil grades for extreme temperatures. Check your manual or ask your supplier.
- Carry spare fluids: Keep bottles of coolant, water, and engine oil in your boot — particularly if you’re driving in remote areas.
- Check tyres: High temperatures can increase tyre pressure, so check and adjust accordingly. Look for cracks or worn treads too — hot tarmac only makes things worse.
- Know local driving laws: Some countries require drivers to carry items like warning triangles, spare bulbs, and reflective vests. These also come in handy if you do break down in the heat.
Health and safety tips for hot weather driving
- Never leave pets or people in a parked car:Temperatures inside a car can rise dangerously in minutes. If you need to stop, open the windows or take everyone with you — even if you’re just popping into a shop or petrol station.
- Stay hydrated: Keep bottled water in the car and take regular breaks on longer journeys.
- Use sun shades: Protect your dashboard and steering wheel from UV damage while keeping the cabin cooler when parked with windscreen shades and window tints.
- Drive early or late: If possible, plan journeys during cooler parts of the day — especially if you’re travelling long distances or towing.
