ISUZU is set to shake-up the 4x4 market later this month when it launches its new-look Trooper powered by a choice of two engines, including a 16v direct injection diesel - a world first in the sector. The new Trooper, which makes its UK debut at next week's Fleet Motor Show at Donington Park, has the option of either a 3.0-litre 157bhp common rail diesel engine or a new 3.5-litre 212bhp V6 24v petrol engine.

In launching the diesel engine Isuzu claims class-leading levels of performance, refinement and economy. Manufactured in the US by Caterpillar, the engine is seen as the biggest technological advance since direct injection replaced indirect injection. The new Trooper - there are 10 models in the range - has a restyled front end featuring a more prominent grille, two-tone paintwork and bold wheel arch extensions.

Unlike conventional direct injection diesels, the 3.0-litre DOHC turbodiesel holds fuel in a pressurised rail and an electronic brain regulates pressure according to engine speed and releases fuel when required. This not only gives the new Trooper a useful power advantage over the old model: 159bhp at 3,900rpm - an increase of 29% - and 245lb-ft of torque at 2,000rpm - a rise of 21%; but it also means Isuzu gains a useful head start over rivals such as the Jeep Cherokee, Mitsubishi Shogun, Toyota Land Cruiser and Land Rover Discovery.