Originally Posted By: NHHEMI
Originally Posted By: glenncof
When QS Q-HP came out the OEM's that were claimed to spec it included Ferrari, Mazarate, Porsche, et al. Now this was 'not' for 10W30 so the base could be different on this grade but these spec's lead me to believe it's Shells XHVI base which I believe is used in PP.
My understanding is PP always uses custom add pack and QS is likely to use off-the-shelf.
Preceding Q-HP there was Q-this and Q-that for a few years after the SOPUS acquisition of the brands. These didn't have the OEMs spec'd like Q-HP.
I suspect SOPUS was working off supply contracts where were prior to acquisition. PP was then used as flagship to attack Mobil since GrpIII could achieve GrpIV performance at a lower cost, hence lots of promo (remember First Driver!).
And it has changed yet again. HP is now discontinued and the new name du'jour is Ultimate Durability.
It still says Horse Power on the bottle.
I do not believe that PP uses the XHVI base stock, as its CAS number is not listed on the MSDS's.