As the motor oil geek has stated PP uses GTL which due to the high quality base stock some of the additives have been reduced. I guess they're not needed as much in the formulation.
I tend to use Mobil 1 since its available locally but from the research i've done HPL is an excellent oil. Not only a strong formulation but keeps your engine squeaky clean on the inside. We even have out or discount code for 15% off
Order from their website advlubrication.com for HPL oil...
