on going maintenance and repair on really nice inheirted(mother) 1997 deville hotrod~this car was/is garaged and treated like a baby. I'm looking to buy a 2006-2009 cts of one of these year's ~maybe the year model with the lesser produced cts with the larger engine. Is it the STS that had a powerful motor that I'm refering to? My mistake. Maybe 05-07?