I saw this mentioned about T5 a few days ago so I looked at the Rotella site. Nothing for T5 or T6..
They do have a clickable link to a brochure for T6 which mentions API SL etc., but the old container is pictured.
T5:
http://rotella.shell.com/products/t5.html
T6:
http://rotella.shell.com/products/t6-full-synthetic.html
Perhaps there's something mentioned on the bottles? They do a great job not marketing the stuff for gasoline engines.
They do have a clickable link to a brochure for T6 which mentions API SL etc., but the old container is pictured.
T5:
http://rotella.shell.com/products/t5.html
T6:
http://rotella.shell.com/products/t6-full-synthetic.html
Perhaps there's something mentioned on the bottles? They do a great job not marketing the stuff for gasoline engines.