R134a
A 1994 Buick Regal Custom uses 134a refrigerant, not freon.
R134a
Dexron 3 or Dexron 4.
The 2002 Buick Regal has overhead valves (OHV).
The 2001 Buick Regal has overhead valves (OHV).
The 2004 Buick Regal has overhead valves (OHV).
The 2003 Buick Regal has overhead valves (OHV).
The 2013 Buick Regal has double overhead cam (DOHC).
The 2012 Buick Regal has double overhead cam (DOHC).
The 2014 Buick Regal has double overhead cam (DOHC).
The 2011 Buick Regal has double overhead cam (DOHC).
Yes