Hi all: i replied to a post on this topic a little while ago : i said it then n ill say it now : i wont use anything but the 98s : i have a my16 ssvr with the w375 : the ls3 is a high comp motor : 98 is the most stable fuel to deal with the temp / pressure conditions in these types of motors as it does suffer pre ignition detonation as 91 can n will do resulting in that knocking / pinging noise that you hear : in the long term continual use of 91 will result in engine damage be it significant or not : 98 has other benefits as well : it burns much cleaner n is more stable against oxidation due to added stability agents by the fuel companies : like ive said before its your car its your choice ☺
