Originally Posted By: donnyj08
Ashland is a blender and a chemical company. They aren't and oil company. Valvoline has partnered with Lubrizol for several years now.
Lubrizol is one of the largest suppliers of motor oil additives. Valvoline is a division of Ashland which blends motor oils from high quality basestocks and additives.
Comparing RP API to Synpower isn't exactly a put down for RP. Valvoline and Lubrizol have received awards from the SAE for their combined efforts in developing "hyper ZDDP".
IMO Ashland is a top notch blender, and the are cutting edge. They have been blending motor oils for 140+ years so they know what they are doing.
I'm not saying RP API is rebranded purple Synpower, however if it were then RP wouldn't have chosen a bad formula to purchase from a quality standpoint.
RP just like Ashland is also a blender and not an oil company. The Non API RP oils are the good oils, and they are priced fair for the amount of additives you receive in them.
HPS is the good stuff. See the VOA I did here;
https://bobistheoilguy.com/forums/ubbthreads.php/topics/3815036/RP_HPS_5w30_VOA#Post3815036
I hadn't thought of that. Then who does Valvoline get their basestocks from?
I'm starting to think addpack is more important than basestocks. But that's probably wrong too. lol