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How big is a factory size fuel tank for Cadillac Seville SLS?

There's no single "factory size" fuel tank for a Cadillac Seville SLS. The size varied slightly depending on the model year and possibly other options. However, you'll generally find that the fuel tank capacity for a Cadillac Seville SLS is around 18-20 gallons. To be certain, you should check your owner's manual or the sticker inside the driver's side doorjamb (often lists the vehicle's specifications).