0w20 vs 0w30 in my Dodge Challenger V-6?

Like I said I use 0w20 in Louisiana for my Caravan. Oil pressure is perfect and flow is better at startup. I have had it to 6500 rpm on more than one occasion as well as idling and the dreaded Eco mode on while below 45 mph which is 90% of my driving. Change Oil at 200 hours without worrying as I average less than 20 mph over last oil change.
 
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