Originally Posted By: bluesubie
They're not all Group III. The difference depends what it says on the bottle. The Group III's state "Synthetic" and the Group IV's state "Fully Synthetic".
-Dennis
Correct. At the very least the 5w40 and 0w50 weights are a Group IV/V blend. The shop I work for has been using it for some time in all our customer's cars and everyone has been very pleased. Almost everyone comments that their engines run notably quieter with Eneos compared to whatever they were running before. I haven't personally run a UOA, but I'll get around to it sooner or later.