I know GM lists a number. I just use the regular stuff. I noticed the wifes car this morning was a little noisy. Just wondering if it'* worth changing or should I just keep letting it warm up the normal 15-20 minutes.

Always better to change the fluid if its making noise.

A friend and I saw a good deal at a local grocery store. See if yours also has a Buy One Get One Free deal on turkey basters! Try an additive like Lucas or so. It works really nicely.