Tom NJ
$100 Site Donor 2026
Originally Posted By: deven
This is an email sent to donnyj08...
Originally Posted By: donnyj08
I emailed RP this: i would like to know if the base stocks used in the API SN oils are hydrocracked group III oils or if they are primarily PAO group IV as many other high end synthetics.
Their reply was:
"Good morning Donny,"
"Although Royal Purple oil formulations are considered proprietary, I am authorized to share with you that we use a proprietary combination of premium synthetic Group IV(PAO) and Group V base stocks. The additive packages are also the very best available for each."
This quote was taken from this thread that donnyj08 highlighted a few posts earlier than yours.
https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2779357&page=1
That quote simply says that they "use" PAO and Group V. It does not state that that they use only PAO and Group V basestocks, or that they do not use Group III. Mobil 1 also "uses" PAO and Group V.
I am not saying that they do use Group III - as I said in my post "No one knows". What I am saying is that they do not clearly and definitively deny it, which makes me suspicious. It seems to me if a company goes to the expense of formulating motor oils based exclusively on expensive high performing base oils like PAO and Group V, they would boast about it, as many companies did in the past before the wide use of Group III. After low cost Group IIIs swept the synthetic oil market, suddenly base oil types became "proprietary". Since all of their major oil company competitors know exactly what they are using, who are they keeping it secret from, and why?
I have no problem with RP, nor do I have any problem with Group IIIs - in fact I think the use of Group III is smart, and I use Mobil 1 which is mostly Group III+. My comments are not related to oil performance, but rather clever marketing language. People can believe whatever they want, just be aware that you are basing that belief of ambiguous marketing statements in the absence of any hard evidence.
Tom NJ
This is an email sent to donnyj08...
Originally Posted By: donnyj08
I emailed RP this: i would like to know if the base stocks used in the API SN oils are hydrocracked group III oils or if they are primarily PAO group IV as many other high end synthetics.
Their reply was:
"Good morning Donny,"
"Although Royal Purple oil formulations are considered proprietary, I am authorized to share with you that we use a proprietary combination of premium synthetic Group IV(PAO) and Group V base stocks. The additive packages are also the very best available for each."
This quote was taken from this thread that donnyj08 highlighted a few posts earlier than yours.
https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2779357&page=1
That quote simply says that they "use" PAO and Group V. It does not state that that they use only PAO and Group V basestocks, or that they do not use Group III. Mobil 1 also "uses" PAO and Group V.
I am not saying that they do use Group III - as I said in my post "No one knows". What I am saying is that they do not clearly and definitively deny it, which makes me suspicious. It seems to me if a company goes to the expense of formulating motor oils based exclusively on expensive high performing base oils like PAO and Group V, they would boast about it, as many companies did in the past before the wide use of Group III. After low cost Group IIIs swept the synthetic oil market, suddenly base oil types became "proprietary". Since all of their major oil company competitors know exactly what they are using, who are they keeping it secret from, and why?
I have no problem with RP, nor do I have any problem with Group IIIs - in fact I think the use of Group III is smart, and I use Mobil 1 which is mostly Group III+. My comments are not related to oil performance, but rather clever marketing language. People can believe whatever they want, just be aware that you are basing that belief of ambiguous marketing statements in the absence of any hard evidence.
Tom NJ