After my fill of Carquest/Amalie 10w-30 HM Synthetic I plan on running 15-17k, I was wanting to do another 20-22K OCI. I was thinking a synthetic SN rated 5w-40 like Delo but was also thinking of running a 10w-30 Pennzoil "PurePlus" Platinum to see if the "Gas to Liquid" bluster has any veracity. What do y'all think?