Originally Posted By: Jason Adcock
Dodge specified 5W-20 for a reason. One of them is proper operation of the MDS system (does your Durango have that)? Either way, I wouldn't think twice about running it. I run 5W-20 in our '07 Chrysler (3.8L V6) and in our '07 Corolla (1.8L L4). In both cases, 5W-20 is specified from the factory, for all climates. Even with the 100*F heat of southern NC summers, it does fine for the 5000 mile OCI.
+1, same goes for HOTexas weather in summer. 5w-20 handles it fine. If you are mildly concerned, use a semi-synthetic but SAE SM 5w-20 runs just fine in extreme hot weather.