I see the GT uses the expensive stuff with the friction modifier already in it. What is called for in the V6 and how much does it take? Can I use Mobil 1 gear oil? No mention of specs in the owners manual of course.
Our V6's uses any standard gear lube.
It takes about a liter and a half.
Don't see any problem with Mobil 1 as long as its the correct weight.
GM dealer I went to used Castrol synthetic 75/90 gear lube.
For what it's worth, awhile ago contacted Mobile 1 inquiring if their differential fluid contains friction modifiers that meet General Motors qualifications for carbon-lined differential's and... crickets.
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