total of 16 quarts
2003 cad deville takes 4 quarts of motor oil
11
11
5.5 quarts 5w-30w
12
It takes 5.5 Quarts with a fresh filter.
If it's the base Sedan Deville with the 4.9 liter, it's 5 quarts with the filter. For the Deville Concours with the Northstar, it's 7.5 quarts with the filter.
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7.5, but you'll be good with 7.
According to my Cadillac dealer, the 98 DeVille holds 8 full quarts 7 1/2 quarts to the center of operating range only add 7 1/2 at oil and filter change!!
My 4.9L takes 7 1/2 Qts. with filter