I agree, once you mix the componets from the combustion process with the oil, plus the condensation, fuel, etc...the oil seems to act like honey on a cold day
Another Freezer Test™
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I agree, once you mix the componets from the combustion process with the oil, plus the condensation, fuel, etc...the oil seems to act like honey on a cold day
That's all he gave in the example. It may have been hypothetical even, the point being that above the temperature at which the SAE30 and the 10w30 are the same viscosity (which for some comparisons may be other than 100C), the SAE30 will thin more.
Not saying you are wrong, I agree this looks suspicious, but I wonder if they would admit to this? It would just smack of false advertising (to me.)
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Not saying you are wrong, I agree this looks suspicious, but I wonder if they would admit to this? It would just smack of false advertising (to me.)
I suspect that PC's Duron 30 is made from Group II+ base oil with a VI of around 115. Toss in an esterfied additive package and you easily get a finished VI of 123 with no VI imporver.
True, the better the SAE30 is compared to the 10w30, the higher the temperature would be where the SAE30 would become thinner. If that temperature is high enough it won't occur.
Cool, that is good to know. I didn't think it was kosher to add VIIs to a straight grade oil.
I think the real point here is that thinning at higher temps is a product of the VI of the respective oils for both single and multigrades. There is nothing inherent in a multigrade that will make it thin less than a single grade of the same viscosity at high temps.
its refreshing to see some straight grade talk. the thin is better crowd likes to make monograde or thick oils seem like a tub of cold butter at anything below room temparture.
Yes. In that VII is merely increasing the Viscosity Index, you are absolutely right. You have a way of honing a discussion to the bare essence to get at the root truth.
That would make for a interesting blend (and a very good oil at that)
There are some Group II base oils in the 11.0 - 12.0 cSt range, but their VI is right around 100, and they are more expensive than the lower viscosity Group II's -- costing almost as much as Group III's.
This issue needs its own topic -- so I'll start a discussion on it.
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That would make for a interesting blend (and a very good oil at that), but there are no Group II+ base oils in the range of a 30 weight. AFAIK, all the Group II+ base oils are in the 4.0 - 6.0 cSt range -- they are used for the mainstream motor oils like 5W-20, 5w30, and 10w30.
A good observation and salient point.
The Duron with a VI of 123 is an interesting anomaly. But is it really when you consider that Valvoline's SAE30 is made from Group I and has a VI 113?
Theoretically, Group I base oils can have a VI of between 80 and 119, just like Group II. Realistically, I don't think anyone makes Group I with a VI higher than about 105 (and these are generally called Group I+ since the more typical Group I VI is
As I said, I think the Valvoline 30 is made from Group I+ and the additive package is kicking the VI up a bit.
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