That doesn't mean it doesn't perform to those levels, but for warranty
purposes, this is not an API certified product. To be fair, some Amsoil
products are API certified and they do have the correct labelling, but
their top-tier products do not. The issue of fake API labelling and
non-compliance has caused such a stir at Amsoil that they had to put an
entire page up on their site dedicated to answering this particular
question. You can find it here. Basically what it boils down to is
money. Amsoil don't want to pay the $300,000 it can cost for an API
certification of a single oil formulation, and getting API certification
can limit them to single vendors for some of the raw products they use.
If those vendors put their prices up or go out of business, Amsoil need
to either pass the increase in price on to the consumer, or go through
the whole API thing again from scratch.
http://www.carbibles.com/engineoil_bible.html