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How Do Viscosity Index Improvers Work? #4583594
11/24/17 11:37 AM
11/24/17 11:37 AM
Joined: Dec 2013
Posts: 2,226
Alabama, United States
Red91 Offline OP
Red91  Offline OP
Joined: Dec 2013
Posts: 2,226
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?


'89 Chevy 1500
Supertech 20/50
'15 Chevy Cruze
AcDelco syn dexos 5/30
Re: How Do Viscosity Index Improvers Work? [Re: Red91] #4583596
11/24/17 11:41 AM
11/24/17 11:41 AM
Joined: Aug 2008
Posts: 21,242
ON, Canada eh?
StevieC Online content
StevieC  Online Content
Joined: Aug 2008
Posts: 21,242
ON, Canada eh?


'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF
Re: How Do Viscosity Index Improvers Work? [Re: Red91] #4583616
11/24/17 12:07 PM
11/24/17 12:07 PM
Joined: Oct 2004
Posts: 8,309
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 8,309
Cincinnati, OH, USA
Chevron has a good explanation here:
https://www.oronite.com/paratone/tempeffect.aspx


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: How Do Viscosity Index Improvers Work? [Re: Red91] #4583635
11/24/17 12:27 PM
11/24/17 12:27 PM
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,075
Kalifornia Kollective
By coiling up and uncoiling. They are open plastics that carry oil, but they are not oil ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: How Do Viscosity Index Improvers Work? [Re: Red91] #4583636
11/24/17 12:28 PM
11/24/17 12:28 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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.


Re: How Do Viscosity Index Improvers Work? [Re: bullwinkle] #4583653
11/24/17 12:44 PM
11/24/17 12:44 PM
Joined: Dec 2016
Posts: 7,132
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,132
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: How Do Viscosity Index Improvers Work? [Re: Red91] #4583762
11/24/17 03:07 PM
11/24/17 03:07 PM
Joined: Oct 2011
Posts: 945
Toronto ON
Solarent Offline
Solarent  Offline
Joined: Oct 2011
Posts: 945
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/

Re: How Do Viscosity Index Improvers Work? [Re: Linctex] #4583765
11/24/17 03:09 PM
11/24/17 03:09 PM
Joined: Oct 2011
Posts: 945
Toronto ON
Solarent Offline
Solarent  Offline
Joined: Oct 2011
Posts: 945
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.

Re: How Do Viscosity Index Improvers Work? [Re: Red91] #4583869
11/24/17 05:39 PM
11/24/17 05:39 PM
Joined: Dec 2002
Posts: 41,529
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 41,529
'Stralia
Eg, Asteric...looks like a *

Re: How Do Viscosity Index Improvers Work? [Re: Solarent] #4583913
11/24/17 06:38 PM
11/24/17 06:38 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
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

Re: How Do Viscosity Index Improvers Work? [Re: Red91] #4583945
11/24/17 07:16 PM
11/24/17 07:16 PM
Joined: Dec 2013
Posts: 2,226
Alabama, United States
Red91 Offline OP
Red91  Offline OP
Joined: Dec 2013
Posts: 2,226
Alabama, United States
So, the oil molecules are inside the polymer molecule coils?


'89 Chevy 1500
Supertech 20/50
'15 Chevy Cruze
AcDelco syn dexos 5/30
Re: How Do Viscosity Index Improvers Work? [Re: Merkava_4] #4584075
11/24/17 09:45 PM
11/24/17 09:45 PM
Joined: Dec 2002
Posts: 41,529
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 41,529
'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.

Re: How Do Viscosity Index Improvers Work? [Re: Shannow] #4584270
11/25/17 07:57 AM
11/25/17 07:57 AM
Joined: Jul 2011
Posts: 109
MICHIGAN USA
LEADED Offline
LEADED  Offline
Joined: Jul 2011
Posts: 109
MICHIGAN USA
Everything being equal I will choose a PCMO with the lowest VI .

Re: How Do Viscosity Index Improvers Work? [Re: Red91] #4584296
11/25/17 08:30 AM
11/25/17 08:30 AM
Joined: Dec 2013
Posts: 2,226
Alabama, United States
Red91 Offline OP
Red91  Offline OP
Joined: Dec 2013
Posts: 2,226
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?


'89 Chevy 1500
Supertech 20/50
'15 Chevy Cruze
AcDelco syn dexos 5/30
Re: How Do Viscosity Index Improvers Work? [Re: Red91] #4584300
11/25/17 08:35 AM
11/25/17 08:35 AM
Joined: Dec 2005
Posts: 10,277
Upper Midwest
kschachn Online content
kschachn  Online Content
Joined: Dec 2005
Posts: 10,277
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.


1994 BMW 530i, 238K
1996 Honda Accord, 266K
1999 Toyota Sienna, 407K
2000 Toyota ECHO, 280K
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