I would check the vin#.
here is more of the campaign
General Motors has decided that certain 1999 Oldsmobile Aurora model vehicles, equipped with 4.0L engine (RPO L47, VIN C) and Cadillac Seville, DeVille and Eldorado model vehicles equipped with 4.6L engine (RPO LD8, VIN 9 or RPO L37 VIN Y) may exhibit a condition in which they cylinder head bolts may become loose and cause coolant leaks and possible engine damage. This may be due to the engine block cylinder head bolt counterbore holes being machined too deeply into the engine block.
To prevent the possibility of this condition occurring, dealers are to inspect vehicles held under the above referenced stop delivery and those delivered to customers. Depending on the findings, the engine may not require any further repairs, may require replacement or the vehicle may need to be returned to GM.
Involved are certain 1999 Oldsmobile Aurora model vehicles equipped with 4.0L engine (RPO L47, VIN C) and Cadillac Seville, DeVille and Eldorado model vehicles equipped with 4.6L engine (RPO LD8, VIN Y and RPO L37, VIN 9), and built within the VIN breakpoints shown
Important: Dealers should confirm vehicle eligibility through VISS (Vehicle Information Service System) prior to beginning campaign repairs. Information for Oldsmobile Auroras delivered to customer will be loaded in VISS at a later date when 4.0L engines are available and Oldsmobile owner letters are mailed. [Not all vehicles within the above breakpoints may be involved]