My 2005 Cadillac CTS LS 3.6L VVT is an early production car for the 2005 model year, built in May of 2004. Last 6 digits of VIN are 100648.
The first few thousand cars are the guinea pigs, they were getting up to speed on building them and I am sure (as evidenced by my car) that the made many mistakes or found defective parts in the first few weeks of production. Before my car hit 3,000 miles they had replaced the catalytic converters (2 on car), o2 sensors, battery and rear G80 differential assembly (Getrag). The differential took weeks to get and had to come from the warehouse in Lansing servicing the assembly plant.