If you're concerned run a high quality 0w20, like M1 0w20 EP. This is not a high performance engine, and where you're located you will benefit from the thinner oil, regardless if the 30 weight is 0w30, its still much thicker than an 0w20. I used kirkland dexos1g2 0w20 and the car runs fine here in SoCal. 0w20 is pretty standard now and full syn. It's not like 5w20 was born yesterday. I'm pretty sure the oiling system was changed with the switch to 0w20.