http://img.verticalscope.com/autoguide.com/misc/HPS-500X600.jpg (http://royalpurple.com/?utm_source=AutoForums&utm_medium=sticky&utm_campaign=AutoForums_hps)

that's a uhhhh big ad...

Hmmm... does that mean this new oil isn't API-licensed?

exactly. it is not API certified, and the manufacturer could void your warranty becasue of it.

Doesn't mean its bad oil.