R12, unless it has been converted.
dextron II (2)
134a refrigerant.
R 12
you could use regular transmission fluid.
mercon IV or V
It would have been built with R12, can be converted to R134a.
Fluid for what? A WHAT 2500? General Motors? Dodge? We need to know these things in order to give an answer.
22.4 ounces of sae 20w-40
10W30
The 2014 Buick Regal has a 6-speed automatic.
The 2004 Buick Regal has a 4-speed automatic.
The 2002 Buick Regal has a 4-speed automatic.