15 per cent of us have no idea how to open the bonnet of our car.
A further one fifth don't seem to know what many of the warning lights are for.
A survey of 2,000 drivers shows one in 20 doesn't know how to fill up on screenwash, with more than a few motorists admitting to putting water in the oil tank
A quarter of people have filled their car up with the wrong fuel.
The most common crime against motoring is driving with the handbrake on - with many saying they didn't know what the red light on the dash came on for.
