87 or 89 is what the factory says to use.
It takes the green Antifreeze
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It can be done it will take A LOT of work it won't bolt right up.
Regular 87 Octane.
Could be a bad compressor.
There is no safety lock on the rear windows. They roll down that far for reason. The wheel well is in the way.
take it to chevy
A 2005 Chevy Tahoe will take a maximum of 5. 5 quarts of oil. As always, it is best to check the level on the dipstick when changing oil.
5 to 6 quarts.
Try 87 Octane if it does not ping excessively should be ok - if it does ping try 89 Octane
With filter change 6.0qts