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viscocity modifier #5456602 06/18/20 07:06 AM
Joined: Aug 2009
Posts: 142
bonjo Offline OP
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Joined: Aug 2009
Posts: 142
I am aware of the product being added to mineral oil to widen the temperature viscocity range of the base oil.

But not sure what the situation with full synthetic oild is. ???
Do they still have these added or not? Is it the same for all brands?

I am only talking about viscocity modifier not other addtivies

Re: viscocity modifier [Re: bonjo] #5456618 06/18/20 07:27 AM
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Zaedock Offline
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What is your definition of "Full Synthetic"?
Have you read through the Main page of the forum website?

Motor Oil University.

2019 Escape EB AWD/2016 KIA Optima SXL 2.0L Turbo/2012 F150 Ex-cab 5.0L
1992 YJ "The Heep"/2015 Chrysler 200 Limited
1975 Ford Bronco/1959 Willys CJ5/Tube Rock crawler
Re: viscocity modifier [Re: bonjo] #5456624 06/18/20 07:31 AM
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kschachn Offline
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And the answer is yes they do, except in some very limited circumstances and brands.

1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: viscocity modifier [Re: bonjo] #5458048 06/19/20 08:11 PM
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MolaKule Offline
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...Viscosity Index Improver or Viscosity Modifier (Performance Additive): Olefin copolymers (OCP's), hydrogentated styrene-diene copolymers, styrene esters, polymetharylates (PMA's), mixed alkyl methacrylate-vinyl-pyrrolidines, aminated ethylene propylene, mixed alkylmethacrylate ethylene/propylenes; reduces viscosity change with temperature. Increases viscosity of base oil as temperature rises when base oil tends to thin. Some VII's may also act as dispersants by incorporating dispersant compounds.

As kschachn stated VII's are used in synthetic formulations as well as conventional (mineral) oil bases.

The exception is in very specific cases where the mix of fully synthetic base oils give rise to the proper viscosity index without any VII's.

Last edited by MolaKule; 06/19/20 08:17 PM.

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