Have 2011 Durango R/T Hemi (29,000. miles, I drove 1500 miles in 5 Months.
Just replace oil with Pennzoil Synthetic 5/20, How many months can I go before Oil Change at this type of Miles?
I Do live in Arizona, Heat is not bad now but Summers are 110+ Degrees.

 

I change mine every 4500-5000 miles and I only use Penzoil Ultra 5w/20
As far as time goes I dont let it go more than 4 mths, but I have more radical temperature changes and more humidity than you.
The problem with cars sitting is the oil settles and also moisture from Humid conditions builds up inside engine.
STEVE

 

I change oil and filter every 5k miles or 6 months whichever comes first.

 

Just add oil anytime it gets low.