Easy to tell by looking at the bottle. The Gr. IV all say 100% SYNTHETIC
They are (product code)
Series 2000 20W-50 Racing Oil (TRO)
Series 2000 0W-30 (TSO)
Series 3000 5W-30 (HDD)
[ May 25, 2003, 08:19 AM: Message edited by: Mike ]
As Paul said, greases and gear lubes are Group IV (possibly some Group V added).
On the other hand, don't know what group the synthetic in the semi-synthetic Bar and Chain Oil is, nor in the Semi-Synthetic EP Slideway, Chain and Gear Oil.
But no-one else has asked about it. I'd guess that 99.4% of consumers don't know and don't care.
Why else would the guy with the new Mercedes be out looking for the $11.95 oil change special??
Why did Amsoil choose to do this for the gear oil and grease?
For $7+/qt of non-series 2000 gear oil you'd assume it would be a Group IV.
Also, I assume that their universal ATF is also a group IV and not a group III or II/III blend?