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i believe thats a semi- synthetic.the 5w40 synthetic covers a greater range and is a full synthetic.oil .
Yep its a semi synth. I am planning on changing to full synth just before the cold weather sets in here. My IDI has 168000 on dino oil so I though I would break her in gently by going semi synth for a few hundred miles.
T6 is a full syn, whereas T5 is not. However, for $11.50 a gallon, I'll run it from April until next October, when I used to run 15W-40. It also goes in my beater Subaru, my 22R plow truck, and everything else I have that needs oil. With the exception of my parents' vehicles, which call for 5W-20, everything else in the family gets Rotella.