I am wondering what would be the best on the shelf full synthetic oil for my girlfriends car. It's a 2012 Kia Forte ex. Has the 2.0 liter naturally aspirated motor. I believe it states in the oil cap 5w-30 motor oil. Currently at cold start it has just a slight valve tick but only at idle. So I'm wondering if changing viscosity would help it out at all? Any help would be appreciated. Thanks!
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