Is a 1988 Cadillac sedan Deville classic car in 2008?

No, a 1988 Cadillac Sedan DeVille was not generally considered a classic car in 2008. The general rule of thumb for classic car status is that a car needs to be at least 20-25 years old. While it was getting closer, it hadn't reached that threshold yet. A car's collectibility also depends on other factors like condition, rarity, and historical significance, and the 1988 DeVille wasn't particularly rare or historically significant in the way some earlier Cadillacs were.