1-2 VI difference is within margin of error, PC's document could also be inaccurate as are most other TDS from oil manufs. You also have to cut out all the less respectable brands in the PQIA chart for a fair comparison because there is still a difference between "top shelf" dino & bottom of the barrel dino.
153 VI for a dino is nothing special especially coming from PC's own TDS. If it was tested by PQIA and scored a 163 then I'll be impressed.
Originally Posted By: wemay
Originally Posted By: HKPolice
Nope, 153 is pretty average:
http://www.pqiamerica.com/Feb2014/consolidated5w20ALL.html
I don't remember where I read the 20% figure, but a quick google found this link that backs up that number:
http://www.bronsautomotive.com/oil-change-intervals/
"Synthetic blend oil contains only 20% Synthetic oil and 80% regular oil in each quart. I do not personally use this type of oil, but if you do, use the same intervals as regular oil."
Of course I'm sure that most good name brand blends are probably much higher than 20% though and maybe 20% isn't even the real minimum, oil marketing laws are so vague and hard to enforce.
Originally Posted By: wemay
HK...
For a 5w20, a VI of 153 seems on the high end for a conventional, no? Can you share where the information concerning what % constitutes entry into the world of blends can be found? I never heard this before. Not being sarcastic either.
Of the 37 oils listed, it technically has a higher VI than 30 of them
. Thanks for the link as well but, Brons Automotive inc. doesnt seem to be an authority in the industry of oil formulation and blending.