Originally Posted By: Garak
Originally Posted By: alarmguy
Im not into the CI vs CJ thing but I have noticed, the 20/50 C oils seem to be CI4 rather then CJ4.
Perhaps if nothing is calling for a CJ-4 20w-50, there would be no reason to make such an oil. Heck, plenty of 20w-50 oils don't even claim a long obsolete C spec, like they used to.
Originally Posted By: alarmguy
Kind of strange you can buy S rated oils in all flavors, but not C.
Well, it's not surprising given what CJ-4 actually calls for. You need an oil with a minimum HTHS of 3.5, so anything that has an ILSAC rating is already disqualified, and that's not even getting into additive levels.
Thanks for the explanation.