Originally Posted by flyboy1100
exactly what my point was.
The API establishes the guidelines for certification, it is up to the manufacturer to have the oil tested if they choose. The API really doesn't care if it is manmade or it came out of the ground, they are just in the testing business (as far as this topic is concerned)
I guess to get the API icon on your oil you have to pay for the tests as well but not having it there doesn't mean you wouldn't pass the tests. kind of like organic food. sometimes it's just not worth the certification process.
do you have any information on why signature series didn't get the API cert?