Opel has added a fourth variant to its Astra family after the five-door hatch, Sports Tourer (wagon) and GTC Coupe – the sedan. It will make its motor show debut at the 2012 Moscow Auto Salon late August.

This one is pitched slightly differently, though. Instead of just the usual developing markets like Russia and Turkey, Opel also sees significant conquest potential in Western Europe, which is of course a continent of hatchbacks, especially in the C-segment where the Astra plays.

They’re marketing it as an affordable alternative for customers who would usually opt for this kind of car in the mid-size segment – a cheaper (and smaller) alternative to the Insignia/Mondeo, in other words.

Customers can choose between seven engines: four gasoline units (100 hp to 180 hp), of which three can be combined with a six-speed automatic and three diesel engines (95 hp to 130 hp).

The two 1.7 CDTI ecoFLEX models with Start/Stop and further efficiency enhancing tech combine outputs of 110 or 130 hp with diesel consumption figures as low as 3.7 litres per 100 km. They emit only 99 g/km CO2. In addition, early next year will see the introduction of Opel’s new SIDI ECOTEC 1.6 four-cylinder petrol engine with turbo and direct injection.

The Astra sedan measures 4,658/1,814/1,476 mm (L/W/H) and has a wheel base of 2,685 mm, which is good in this class. The boot offers 460 litres of volume – 90 litres more than the five-door hatch. By folding the 60:40 split rear bench flat, luggage volume can be increased up to a maximum of 1,010 liters.

“The Astra model family implements our design language with sculptural artistry meeting German precision in a very dynamic fashion. We believe that the Astra four-door sedan we’re now launching is the best proportioned and most stylish notchback currently available in the compact segment,” said Vice President of Design, Mark Adams. Looking quite sleek, the Astra sedan is easily recognisable as a modern GM Europe product.