it might say on the dip stick or owners manual or ask at the parts store
from what I've read about auto trans fluid they do have different viscosities , the first ones used whale oil as a conditioner and that worked great , then whaling was a no-no and they've been trying different formulas hence dextron I , II , III , IV , VI and so on .
Looking for a Used G6 in your area?
CarGurus has 153 nationwide G6 listings starting at $1,982.
Search Pontiac G6 Questions
Pontiac G6 Experts
Related Models For Sale