Originally Posted by Snagglefoot
Wait Garak, isn't the T6 0w40 SN?
Yes, it is. As SubaJew mentioned, it's CJ-4/SN, which is relatively uncommon, and that probably explains why. If the T6 0w-40 migrates to CK-4, Shell might not carry on with the SN. Delvac 1 LE 5w-30 was also CJ-4/SN rather than CJ-4/SM, given the time period in which it was released in North America. Ordinarily, we'd look at either as the normal CJ-4/SM lube of the day, but they were brought out after the SN rollout, rather than before, when most other CJ-4 lubes were sent out. That reminds me of the Delvac 1 LE 5w-30 certifications. It was new enough in North America to have gotten SN, old enough to have been CJ-4, and also old enough to have the previous iteration of the Ford spec before they got wigged out about phosphorus, since LE was a low phosphorus lube by virtue of its ACEA specs.