BMW has unveiled the BMW 130i -- a car powered by the world's lightest six-cylinder petrol engine.

First seen on the BMW 630i and the BMW 330i, the new car boasts 258 horsepower.

The aluminium and magnesium alloy 3.0-litre straight-six petrol engine powers the BMW 130i from zero to 62mph in 6.2 seconds and on to a top speed of 155mph.

Jim O'Donnell, managing director of BMW (GB), said: "The 1 Series has proved a real hit in a market where a rear-wheel-drive car is unique and the arrival of the 130i promises to shake things up further.

"Some have already referred to the model as a baby 'M' car -- something that is not surprising given it can lap the Nrburgring in a time that wouldn't disgrace an M3."

Several key styling features mark the BMW 130i out from the four-cylinder-powered models already on sale. The new car receives chrome kidney grille slats, features 17-inch alloy wheels and displays large, twin chrome exhaust pipes at the rear.

These are more than a styling enhancement though, as the last section of the exhaust system also plays an important role in the performance of the car thanks to a valve in the rear section opening and closing depending on throttle input. At rest and slower speeds the valve is closed for better emissions, while at higher speeds it is opened fully for improved engine breathing and a more satisfying aural note.

Standard interior trim for the 130i includes Sports seats, leather steering wheel, BMW Business radio with single CD player and six airbags. Customers will also be able to specify BMW's innovative and award-winning Active Steering system that ensures the optimum steering ratio at any speed.

An unveiling at the Geneva Motor Show in March heralds the first public appearance of the 130i before it goes on sale in the UK in the autumn. Prices will be announced at a later date.