Tesco, Morrisons, Sainsbury's, Asda drivers can get '10 per cent off' if they've hit certain mileage

Drivers can save "10 per cent" on Tesco, Asda, Sainsbury's and Morrisons petrol and diesel shops with a quick check. Specialists at Carlease.co.uk have stressed that a “clean air filter” can dramatically increase gas mileage for motorists.

It could be putting serious “strain on the engine", the road users and motoring experts have warned drivers up and down the country. Carlease.co.uk said: “Thick debris and salt can clog your car’s air filter if left uncleaned for a long period, reducing fuel efficiency and compromising the air quality within your vehicle.

“The increased use of air conditioning in hotter months can strain the engine if you're running on a blocked filter, causing unnecessary wear to your AC units that could incur repair costs of up to £1,000. As a rule of thumb, replace your air filter every 12 months or 12,000 miles - depending on the road and air conditions you drive in - as a clean filter can improve gas mileage by up to 10 percent and extend the life of your car.

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“Doing so can also keep your car pollutant-free, especially during summer when pollen counts are high.” An air filter helps your engine run smoothly. It does this by intercepting tiny particles like dust and dirt before they reach your engine. This helps your engine run efficiently, as these particles can cause damage if not trapped. A clean air filter also ensures the optimal amount of clean air mixes with your fuel. This enhances engine performance and fuel efficiency.

How often you change your air filter depends on your car. Usually, manufacturers recommend replacing them in an annual service or every 12,000-15,000 miles—whichever comes first. If you’re unsure, check your vehicle’s manual for specific recommendations. Regular replacement helps keep your engine running smoothly.

Signs you need to replace the filter include 12 months or 12,000-15,000 miles (whichever sooner) since your last change, air flow issues and reduced fuel efficiency.