I used to, but not any more.
Several years back, I used to only use 10w30 as specified for the Grand Cherokee. Then went with 5w30 year round to use the same oil as the Wrangler. That was in VA where lowest temps in winter got to maybe 10*. Now with our move to MT, have moved to 0w30 year round.
These changes went with extending the OCI; from 3k to 5k and up to 10k, and one year intervals with synthetic.