10-W30 but I would use a 10-W40 synthetic blend because of the age.
R134A
5w30
It should be the orange Dex Cool.
SAE 75W90 synthetic gear oil.
You will use a PAG 46.
Use SAE 5W-30 engine oil in your Chevy Silverado if possible. If 5W-30 isn't available, you may use 10W-30 if temperatures are not expected to fall below 0 degrees Fahrenheit.
10w30
I use 5W30 @ 120k
Penzoil 10W30
5w30 or 10w30
10w30
Use SAE 10w-30 Synthetic oil such as Mobil 1.