The Omega was launched in 1994 to replace the well-liked Carlton and Senator ranges at one stroke. Hence the wide selection of engines offered from the very start; 2.0-litre eight and 16 valves and 2.5-litre and 3.0-litre V6s. There was also a smooth 2.5-litre turbo diesel six-cylinder engine, sourced from BMW, supplemented in January 1998 by a two-litre TD, itself supplanted by a direct-injection unit in April 1999.
Initial customers chose between saloon and estate bodies and six basic levels of trim; Edition S, Select, GLS, CD, CDX and Elite. A sporty MV6 model with the 2.5-litre V6 engine was launched in 1998, as was a 2.0-litre DTi diesel version. The range received a substantial facelift with revised nose, tail and interior styling plus a new 144bhp 2.2-litre four cylinder engine in September 1999.
In early 2001, new engines were introduced including a 125bhp DTi turbo diesel unit borrowed from the Vectra. The 2.5 V6 was replaced by a 2.6-litre unit and in Spring 2001, the 3.0-litre V6 was replaced by a 3.2-litre unit. The entry-level 2.0-litre petrol engine was eventually dropped. The last Vauxhall Omega models were sold in the opening months of 2004.