Originally Posted by SubieRubyRoo
So here's a (honest) question for both sides: the "haters" who think Group IV/V are the only true synthetics, and the rest of us who know it makes little difference to 99% of engines on the road today:
Can you duplicate the properties of GTL identically from "real" crude? If yes, Can you do it cost effectively to match the price point of Shell's GTL oils?
The Fischer-Tropsch process can be used on basically anything that's a complex hydrocarbon, IIRC. The Germans used it to make Kerosene from coal. When used in the manner in which Shell uses it, it produces a very pure hydrocracked Group III base oil, in a narrow range of viscosities. The performance is not unlike other group III+ base oils like VISOM, Yubase, or Petro-Canada's PURITY.
Shell invested an absolutely obscene amount of money in Pearl and it produces a lot of product. So for them, using that product broadly in their product portfolio as well as selling it to other companies like XOM is the most cost-effective solution.
Originally Posted by SubieRubyRoo
IMO, if the first answer is no (I don't know because I'm not an oil chemist), then I think that solves the whole "syn/non-syn" argument bereft of any political games... because how many of our engines have ever been able to decipher politicians? Considering we have some very well versed members in UOAs who have collected and analyzed thousands of samples and cannot statistically prove any wear reduction benefit to "real" synthetics even over conventionals, please tell me what the true benefit is other than peace of mind and stroking of your own ego that you spend more on maintenance than others do?
If the second answer (price point) is no as well, who would ever pay more for plain old refined crude than GTL if performance is the same? So OP, my answer is yes, PP is synthetic.
I'm not sure how answering that bit does anything for the Group IV/V argument though
PAO is a different base in its construct. While both it and Group III have essentially zero solvency and need to be blended with other bases for additive suspension, PAO is not a waxy base and thus isn't dependant upon PPD's for its low temperature performance. PAO has some performance advantages over Group III, and that's one of them. This is likely why we see PAO still being used in XOM's 0w-xx's despite its higher cost. You can use a slightly heavier PAO base and less VI and not require the use of PPD's, which likely makes meeting certain performance targets easier.