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Originally Posted by endless_pain
That's what you thought, are you trying to sound tough in a public forum?
Do you want to have an honest conversation for the benefit of the forum or just be right?
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No, I'm not trying to be tough. I'm just trying to stop some of the misinformation around here. You are mentioning percentages so I would like for you to provide some evidence to that effect.
The term synthetic is only a marketing term and "100% synthetic" and "Full Synthetic" are marketing terms.
Hey, look what I found on Al Gore's internet. This guy retired from a company that produces ester base stocks, so he might know a thing or two:
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Originally Posted by Tom NJ from BITOG
Base oil quality is no longer defined by just three simple categories consisting of conventional, semi-synthetic, and synthetic. With the introduction of new processes and feed stocks over the past dozen years, we now have numerous base oils grades and blends thereof, resulting in a continuum of base oil quality, such as:
Grp I
Grp I & II blend
Grp I & III blend
Grp II
Grp II & III blend
Grp II+
Grp III
Grp III & IV blend
Grp III+
Grp III & IV & V blend
Grp III+ & IV & V blend
Grp IV & V blend
While the exact quality order of such base oil selections is debatable and dependent on component grade and ratios, the point is that the quality steps are now so small as to make labels such as semi-synthetic and synthetic difficult if not impossible to place. The industry chose to draw a line between Grp II and Grp III in defining “synthetic”, but the difference is merely a single VI point, and therefore meaningless from a performance standpoint.
Certainly there is a meaningful difference between the low end and high end of the spectrum, such as Grp I vs a Grp IV/V blend, but the difference between adjacent levels, and really even levels that are three, four, or five apart, is easily blurred by the additive system.
Hence, the great debate over “synthetic” versus “true synthetic” is dead. The use of the word synthetic today only signifies that the base oil blend leans toward the higher end of quality continuum, and translating that further into finished oil performance becomes a stretch.
Unless you have a special engine or driving conditions, you are better served concentrating on specifications and approvals rather than base oils for estimating oil performance.
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