the Generation 5 M90. Power output is up to in the Grand Prix GTP. As with the L67, premium fuel (91 octane or higher) is required, but the PCM can compensate for lower octane fuel at the cost of acceleration. The use of below 87 octane fuel can cause detonation that eventually leads to engine damage and failure. Applications: 2004–2005 Pontiac Grand Prix GTP 2006–2007 Pontiac Grand Prix GT Special Editions Discontinuation Production of the 3800 V6 engine officially ended on August 22, 2008 at plant 36. There was a ceremony and speakers who extolled the virtues of the engine. Originally, GM had set this date for January 1, 1999; however, due to the popularity among investors and customers and the reliability of the engine, the date was extended. At the end of production, the LZ4 3500 OHV V6 replaced the naturally aspirated 3800 applications, and the LY7 3.6L DOHC V6 replaced the supercharged 3800 applications. See also Buick V8 engine List of GM engines References External links Brief early history of the engine 3800 history page at CanadianDriver.com Buick engines Dauntless V6 engines