for gods sake - read the bloody owners manual It used to be dexcool {orange} but G.M. has had some problems with that. I use a universal coolant I get at wall mart.
GM Dex-Cool, it is the orange colored kind.
Dexcool
The correct coolant is DEXCOOL it has an orange color to it. If your coolant is green the coolant has been changed. It has been found out that DEXCOOL was bad for Aluminum heads and gaskets. Best to switch to the green coolant.
on the driver's side, you need to take out the air filter duct. fairly easy to do. kind of tight after that though. patients...
Dexron 3
Dexcool
5 w30
the red coolant. the pink coolant is used for newer model.
DEX Cool
The Commodore requires a gycol based coolant, its uses a50% coolant, 50% water mix. Ensure the coolant you choose is a high quality and suitable for V6 motor
bum willy bum
Orange