Delving more into the wording on the back of the bottle, oils that have been tested for specifications will be said to "meet" the following specifications.
However, oils that haven't been tested but are believed to meet the specs can be said to be "suitable" for certain specifications. That is, the oil company believes the oil meets the specifications, but has not been formally tested.
For example, here is the wording from Mobil on their M1 0w20:
Quote:
Mobil 1 0W-20 Advanced Fuel Economy synthetic oil meets or exceeds the requirements of:
ACEA A1/B1
API SN, SM, SL, SJ
ILSAC GF-5
Ford WSS-M2C945-A
Mobil 1 0W-20 Advanced Fuel Economy has the following builder approvals:
General Motors Service Fill dexos1™
According to ExxonMobil, Mobil 1 0W-20 Advanced Fuel Economy is of the following quality level:
Ford WSS-M2C930-A
General Motors GM 6094M
API CF
However, Super Tech doesn't have any such wording to it, and is only said to meet API SN. Still a definite quality oil (I run it in the GF's Sebring), but technically speaking difficult to prove that Supertech Syn is at the same quality level as Ultra.