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#4583594 - 11/24/17 11:37 AM How Do Viscosity Index Improvers Work?
Red91 Offline


Registered: 12/09/13
Posts: 2124
Loc: Alabama, United States
Look, I am more than certain this has been discussed many times over, but I think it's a subject that should be kept in current rotation. The easiest way to do that is to create a new thread about it. I also really don't know how they operate. So, in regular conventional multigrade motor oil, how do VII's operate?
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#4583596 - 11/24/17 11:41 AM Re: How Do Viscosity Index Improvers Work? [Re: Red91]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
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#4583616 - 11/24/17 12:07 PM Re: How Do Viscosity Index Improvers Work? [Re: Red91]
bullwinkle Online   confused


Registered: 10/09/04
Posts: 7657
Loc: Cincinnati, OH, USA
Chevron has a good explanation here:
https://www.oronite.com/paratone/tempeffect.aspx
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#4583635 - 11/24/17 12:27 PM Re: How Do Viscosity Index Improvers Work? [Re: Red91]
BrocLuno Offline


Registered: 09/06/15
Posts: 5508
Loc: Kalifornia Kollective
By coiling up and uncoiling. They are open plastics that carry oil, but they are not oil ...
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#4583636 - 11/24/17 12:28 PM Re: How Do Viscosity Index Improvers Work? [Re: Red91]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Viscosity index improvers are long molecular chains made out of polymers that look like roll up ladders. When the oil is cold, the ladder is rolled up. When the oil heats up and gets thinner, the roll up ladder unrolls to counteract the oil's natural tendency to get thinner.


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#4583653 - 11/24/17 12:44 PM Re: How Do Viscosity Index Improvers Work? [Re: bullwinkle]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: bullwinkle
Chevron has a good explanation here:
https://www.oronite.com/paratone/tempeffect.aspx


Fascinating.

"The VII polymer dissolved in oil takes on a coil form."

A guy on a tractor forum discussing 1960's diesels running on 15W-40 said it would kill the engine, because 15w-40 is filled with microscopic plastic beads that expand and thicken the oil when hot. He said older diesels designed to run straight 30 would shear/destroy all the little plastic beads in 15W-40 oil.
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#4583762 - 11/24/17 03:07 PM Re: How Do Viscosity Index Improvers Work? [Re: Red91]
Solarent Offline


Registered: 10/24/11
Posts: 945
Loc: Toronto ON
Originally Posted By: Red91
Look, I am more than certain this has been discussed many times over, but I think it's a subject that should be kept in current rotation. The easiest way to do that is to create a new thread about it. I also really don't know how they operate. So, in regular conventional multigrade motor oil, how do VII's operate?


https://bobistheoilguy.com/forums/ubbthr...ier#Post4137130
https://bobistheoilguy.com/forums/ubbthr...re_#Post3788899
https://passenger.lubrizoladditives360.com/vm-series-part-1/
https://passenger.lubrizoladditives360.com/vm-series-part-2/
https://commercialdevsite.lubrizoladditives360.com/vm-series-part-3/

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#4583765 - 11/24/17 03:09 PM Re: How Do Viscosity Index Improvers Work? [Re: Linctex]
Solarent Offline


Registered: 10/24/11
Posts: 945
Loc: Toronto ON
Originally Posted By: Linctex
Originally Posted By: bullwinkle
Chevron has a good explanation here:
https://www.oronite.com/paratone/tempeffect.aspx


Fascinating.

"The VII polymer dissolved in oil takes on a coil form."

A guy on a tractor forum discussing 1960's diesels running on 15W-40 said it would kill the engine, because 15w-40 is filled with microscopic plastic beads that expand and thicken the oil when hot. He said older diesels designed to run straight 30 would shear/destroy all the little plastic beads in 15W-40 oil.



There are many sizes and shapes of molecules that are used as VII polymers. That guy on the tractor forum doesn't know what he is talking about.

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#4583869 - 11/24/17 05:39 PM Re: How Do Viscosity Index Improvers Work? [Re: Red91]
Shannow Online   content


Registered: 12/12/02
Posts: 39838
Loc: 'Stralia
Eg, Asteric...looks like a *

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#4583913 - 11/24/17 06:38 PM Re: How Do Viscosity Index Improvers Work? [Re: Solarent]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Anybody can post a link.

It's the guy that provides an explanation right out of his head that makes him D'Man ! cool

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#4583945 - 11/24/17 07:16 PM Re: How Do Viscosity Index Improvers Work? [Re: Red91]
Red91 Offline


Registered: 12/09/13
Posts: 2124
Loc: Alabama, United States
So, the oil molecules are inside the polymer molecule coils?
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#4584075 - 11/24/17 09:45 PM Re: How Do Viscosity Index Improvers Work? [Re: Merkava_4]
Shannow Online   content


Registered: 12/12/02
Posts: 39838
Loc: 'Stralia
Originally Posted By: Merkava_4
Anybody can post a link.

It's the guy that provides an explanation right out of his head that makes him D'Man ! cool


LOL, do that, and they ask you for proof.

Provide proof, and you're posting "other people's work"...can't win on BITOG.

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#4584270 - 11/25/17 07:57 AM Re: How Do Viscosity Index Improvers Work? [Re: Shannow]
LEADED Offline


Registered: 07/13/11
Posts: 93
Loc: MICHIGAN USA
Everything being equal I will choose a PCMO with the lowest VI .

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#4584296 - 11/25/17 08:30 AM Re: How Do Viscosity Index Improvers Work? [Re: Red91]
Red91 Offline


Registered: 12/09/13
Posts: 2124
Loc: Alabama, United States
The Chevron Oronite link puts it in basic, understandable terms. If I'm interpreting correctly, the VII allows more flow at lower temperatures because it shrinks the oil's molecules, no?
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'15 Chevy Cruze
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#4584300 - 11/25/17 08:35 AM Re: How Do Viscosity Index Improvers Work? [Re: Red91]
kschachn Offline


Registered: 12/26/05
Posts: 9380
Loc: Upper Midwest
Originally Posted By: Red91
The Chevron Oronite link puts it in basic, understandable terms. If I'm interpreting correctly, the VII allows more flow at lower temperatures because it shrinks the oil's molecules, no?

No. Nothing is happening with the oil. The oil stays the same and it is the polymer molecules that are changing size and volume which influences the viscosity.
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