The C25XE is a Family II, General Motors engine. It is a 2498 cc (2.5L), DOHC 24 valve, 'V' configuration, 6 cylinder engine producing 170bhp. It is commonly found in the larger of the GM range of cars - including the Opel/Vauxhall Vectra, Calibra, Cavalier and Omega. 
| The factual accuracy of this section is disputed.
Please see the relevant discussion on the talk page.(June 2008)
A special edition of the engine was worked by MSD (Motor Sports Developments based in Milton Keynes in England, UK), which includes reprofiled camshafts, giving the engine a boost of 24bhp. This engine appeared in the special edition MSD Vectra GSi's. 
- "Calibra Wiki V6 information". Calibra Wiki. http://www.calibrawiki.com/index.php?title=C25XE. Retrieved on 2008-04-13.
- "EVO Magazine Vectra GSi review". EVO Magazine. http://www.evo.co.uk/carreviews/evolongtermtests/19911/vauxhall_vectra_gsi_v6.html. Retrieved on 2008-04-13.