This is from Printed Amsoil flyers. NOTE: I do not sell this, I get paid nothing for it, I've never sold it and have no connection to the company.. Just picked up a flyer at Atlanta a couple weeks ago.
OE Synthetic Diesel Iol Suitable for both modern and older diesel applications requiring API CJ-4 Specification,
Series says it is recommended for Gasoline enines recommending API SL. Same for their HD Diesel oil (API SL).
Marine 2-stroke NMMA TC-W3 and API-TC
Marine 4-strok NMMA FC-W
Elsewhere in the flyer they say First Full Synthetic to receive Full API certification"
That said, I did not see the API sticker or logo on any of the labels, May be on the caps (As I recall that is normally where it is) but they did not show the caps in the flyer.
Remember that the flyer is prepared by their sales or advertising people so Well you know.. Murphys law for niave young engineers says 50% off corportate claims and another 50% off if you are talking to a salesman.