Here's where to look:
* Driver's side doorjamb: This is the most common location. Look closely at the sticker with other vehicle identification numbers (VIN, etc.). The paint code is often a three- or four-letter code (e.g., WA8, 21U).
* Glove compartment: Sometimes, the paint code is listed on a sticker inside the glove box.
* Owner's manual: While not always present, some owner's manuals included the paint code.
* Dealer service records: If you have access to previous service records from a Buick dealership, they might have noted the paint code.
If you can't find it on the car itself, you might try contacting a Buick dealership with your VIN. They might be able to look up the original paint code for your vehicle.