Four-wheel drive – what is it and do you need it?

Four-wheel drive has long been considered the best solution for winter driving and difficult roads. But as both cars and tires have developed, the need is not as obvious as it used to be. Here we explain what four-wheel drive means, who it makes the most difference to – and when you can do just as well without it.

What is four-wheel drive and how does it work?

All- wheel drive , or AWD, means that the drive force is distributed to all four wheels instead of just the front or rear wheels. The names may differ depending on the car manufacturer – Audi calls it Quattro , BMW xDrive and Mercedes 4MATIC .

In modern cars with four-wheel drive, the driving force is automatically distributed between the front and rear wheels depending on the road grip and driving situation. When a wheel loses grip, more power is sent to the wheels with better grip. In cars with diesel or petrol engines, this is done via a central power distributor or electronically controlled clutch between the axles. On an electric car or plug-in hybrid with four-wheel drive, the power distribution is instead handled by separate electric motors on each axle.

Advantages of four-wheel drive

The biggest advantage of four-wheel drive is its traction, especially on slippery or loose surfaces. When the power is distributed to all four wheels, the risk of the car spinning out is reduced. This provides more stable handling and better balance when accelerating and cornering. It also often makes it easier when towing a trailer.

Disadvantages of four-wheel drive

Four-wheel drive also involves some compromises. The extra drivetrain makes the car heavier and more complex, which affects both price and consumption. For petrol and diesel cars, this means higher fuel costs, and vehicle tax is also higher. For electric cars, the range is shorter and charging stops are more frequent.

Read more: More four-wheel drive in Danderyd than in Jokkmokk

Do I need four-wheel drive? – or is two-wheel drive enough?

Four-wheel drive is particularly justified if you:

• live in areas with snowy winters

• often drive on smaller or poorly plowed roads

• regularly tows a trailer or caravan

• lives in hilly terrain with steep slopes

However, if you mostly drive in city traffic or on larger, well-plowed roads, four-wheel drive makes little practical difference.

Modern stability systems and better tires have made front- or rear-wheel drive cars handle winter driving significantly better than before.

The tires are more important than the drivetrain.

Regardless of whether the car has two-wheel or four-wheel drive, tires are the most important factor for safe winter driving.

A two-wheel drive car with good tires can handle most road conditions without a problem. Four-wheel drive helps you get going, but when it's time to brake or steer, the extra drive wheels have no advantage. Then it's the tires that determine grip.

Read more: How to change to winter tires yourself: step by step

Summary: Four-wheel drive or not?

Four-wheel drive provides better grip, stability and safety in difficult conditions, but involves higher costs in purchase and operation. At the same time, it is a feature that often enhances resale value.

Four-wheel drive is therefore not always necessary – but in the right situation it can make a big difference.