Another "Which oil should I Use" for you guys and gals. 2014 Chevrolet Silverado 5.3l flexfuel Owners manual calls for dexos1 spec at a viscosity of 0w-20 Change interval one year or when OLM reads 0 I live in Georgia (mid-state) Truck is lightly driven, may sit for a couple days between being driven. Mainly short trips (10 to 30 mi.) in rural/ light traffic. Truck is driven easy to moderate. Vehicle has no known issues as it is new. Most definitely prefer synthetic, store bought or other is fine. I tried to follow sticky to provide proper info, if I missed something just let me know. Great site, I have gleaned a truckload of knowledge on many topics here. Thanks in advance.