5w20 is more a winter oil. My local jeep Dealership used the stuff for their oil changes during the winter when I used to take her in. Like you I change mine now, just use a good filter and change it at regular intervals. If the oil is conventional change at 3000 miles, synthetic change around 5000 (some push it to 10000) etc etc. 5w20, 5w30, and 10w30 are all options many use depending on situations.