I picked up 30 quarts of the Autozone clearance Mobil 1 HM 10w40. Also some Castrol HM 10w40. I think these will be ok in the 8.1 big block besides winter time. After i use these up will 0w40 cause more consumption? It has 140k miles and these engines are known oil burners anyways. I'm in northern Michigan so winters are cold. Thanks for any opinions.