well 16 gallons maybe 18 if ya squeeze as much as you can get in there
15
18 gallons
Take out the screws that hold it on.
24.5 gallons
A 1990 Olds Regency's gas tank will hold 18 gallons of gas.
18
most likely 14 to 16 gallons
4.5 or 4 1/2 quarts..
It holds about 15 gallons. Um ehem, It actually hold 18 gallons. The 1999 LSS models only hold 19 gallons.
Depends on what specific Oldsmobile you're referring to, Sparky...
15 gallons. Just look for an OE tank on line an check the specs.