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Havoline 0W20 VI higher than 5w30 and 10w30? #5142752 06/24/19 11:10 AM
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Whammo Offline OP
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I was looking at the spec sheet for Havoline synthetic oils and the 0w20 has a higher VI than all the other oils listed. Do you reckon this must be a misprint?

https://cglapps.chevron.com/sdspds/PDSDetailPage.aspx?docDataId=518483&docFormat=PDF

Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: Whammo] #5142770 06/24/19 11:29 AM
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No. The 0W is thicker at KV100.

You can calculate VI yourself to verify.


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Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: Whammo] #5142774 06/24/19 11:33 AM
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No, I "reckon" it is correct. Why would you think it is not?

Mobil 1 0W-20 is published as 173, well in the same range.


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Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: Whammo] #5142779 06/24/19 11:35 AM
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Okay I guess I don't understand VI then.

Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: Whammo] #5142781 06/24/19 11:37 AM
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No. Simply, viscosity index means the finished oil flows well at low temperature, and doesn't lose viscosity dramatically at operating temperature.

For comparison, Mobil 1 0w-20 AFE's viscosity index is 173, 5w-30 is 172, and 10w-30 is 146.

Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: ad_infinitum] #5142784 06/24/19 11:39 AM
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Originally Posted by ad_infinitum
No. It means that it flows well at low temperature, and doesn't lose viscosity dramatically at operating temperature.

For comparison, Mobil 1 0w-20 AFE's viscosity index is 173, 5w-30 is 172, and 10w-30 is 146.


Okay, so it isn't saying that it is thicker than the others at operating temperature?

Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: Whammo] #5142787 06/24/19 11:44 AM
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Not at all. Viscosity index is a dimensionless number that represents how the viscosity of lubricant changes with temperature. The greater the viscosity index (VI), the smaller the change in fluid viscosity for a given change in temperature, and vice versa. Thus, a fluid with a low viscosity index will experience a relatively large swing in viscosity as temperatures change. High-VI fluids, in contrast, are less affected by temperature changes.

Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: Whammo] #5142792 06/24/19 11:50 AM
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The Critic Offline
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For people in warmer climates, wouldn't a lower VI be a good thing? To an extent of course.

It seems like most high VI oils are loaded with VII and are less shear-stable.


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Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: Whammo] #5142796 06/24/19 11:53 AM
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Originally Posted by Whammo
Originally Posted by ad_infinitum
No. It means that it flows well at low temperature, and doesn't lose viscosity dramatically at operating temperature.

For comparison, Mobil 1 0w-20 AFE's viscosity index is 173, 5w-30 is 172, and 10w-30 is 146.


Okay, so it isn't saying that it is thicker than the others at operating temperature?


Maybe this chart can help you understand: at 40c all the oils are the same viscosity, but as the temperature increases the oils with a lower VI lose their viscosity at a more significant rate in comparison to the oils with a higher VI.
[Linked Image]

Last edited by ad_infinitum; 06/24/19 11:56 AM.
Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: The Critic] #5142817 06/24/19 12:14 PM
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Originally Posted by The Critic
For people in warmer climates, wouldn't a lower VI be a good thing? To an extent of course.

It seems like most high VI oils are loaded with VII and are less shear-stable.


That, or they are blended with extremely thick and thin base oil (synthetic) and the volatility is high, leads them burnt off / evaporate away. I'd try to use 10w30 and 5w20 instead of 5w30 and 0w20 whenever possible.


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Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: PandaBear] #5142846 06/24/19 12:45 PM
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4WD Offline
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Or it benefits (just as a published number) from low cold flow ability - and that does not mean much to me even though I own two 0w20 spec engines …
I could spend $50 gallon to get a really high VI 0w20 - but that's not going to protect my 7500 watt gen better than 15w40 at $12 gallon (would have much lower VI)



Last edited by 4WD; 06/24/19 12:48 PM.
Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: Whammo] #5142858 06/24/19 12:58 PM
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iirc TGMO 0w20 was 200+ VI


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Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: Whammo] #5142876 06/24/19 01:27 PM
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Originally Posted by Whammo
Originally Posted by ad_infinitum
No. It means that it flows well at low temperature, and doesn't lose viscosity dramatically at operating temperature.

For comparison, Mobil 1 0w-20 AFE's viscosity index is 173, 5w-30 is 172, and 10w-30 is 146.


Okay, so it isn't saying that it is thicker than the others at operating temperature?

You would want to look at HTHS viscosity. It represents how a fluid flows in the engine parts at high temperatures. A less useful but highly published number is KV100, or how an oil flows at 100C aided by gravity alone.


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Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: kschachn] #5142883 06/24/19 01:38 PM
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Originally Posted by kschachn
No, I "reckon" it is correct. Why would you think it is not?

Mobil 1 0W-20 is published as 173, well in the same range.



Guess you are too fancy and sophisticated to like the word "reckon".... LOL

Last edited by bbhero; 06/24/19 01:39 PM.

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Re: Havoline 0W20 VI higher than 5w30 and 10w30? [Re: The Critic] #5142995 06/24/19 04:03 PM
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Originally Posted by The Critic
For people in warmer climates, wouldn't a lower VI be a good thing? To an extent of course.

It seems like most high VI oils are loaded with VII and are less shear-stable.

Yes, I think so, assuming it’s well made.
I’m running a full Group III synthetic 10W30 right now, and it offers me all the winter cold starting ability I will ever need, but more shear stable and lower noack volatility than an equivalent 5W30.


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