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Anti-Foaming / Anti-Aeration Additives #5169202 07/23/19 07:37 PM
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RDY4WAR Offline OP
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I'd like to get a discussion going on the types of anti-foaming and anti-aeration additives that are used in modern oils. Which ones are used for common API certified oils and which ones are reserved for more demanding use such as racing oils? I'm noticing more and more oils showing less silicon (polymethylsiloxane) so if that's not the anti-foaming agent, what is?


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: Anti-Foaming / Anti-Aeration Additives [Re: RDY4WAR] #5169218 07/23/19 07:58 PM
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Loobit Offline
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Group 4 PAO oil and some group 5 esters are naturally harder to foam up compared to group 3 and less oils. More and more oils are using a blend of group 3, 4 and 5 base oils, so less anti-foaming additives are used. There are also acrylate copolymers.

Re: Anti-Foaming / Anti-Aeration Additives [Re: RDY4WAR] #5169306 07/23/19 09:45 PM
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MolaKule Offline
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Still Formulatin' out there are Ya? grin2

Some are using alkyl acrylate polymers which speed up air release faster in colder temps than do the dimethyl siloxanes.

Some may use both.

Last edited by MolaKule; 07/23/19 09:49 PM.

The value of a scientific theory is its ability to prompt further study, not that it has any relation to the established facts of scientific reality.
Re: Anti-Foaming / Anti-Aeration Additives [Re: MolaKule] #5169311 07/23/19 09:47 PM
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RDY4WAR Offline OP
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Originally Posted by MolaKule
Still Formulatin' out there are Ya? grin2

Some are using alkyl acrylate polymers.


I have a lot of time on my hands. I figure I might as well learn something. grin2



"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: Anti-Foaming / Anti-Aeration Additives [Re: RDY4WAR] #5169549 07/24/19 09:12 AM
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Miller88 Offline
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I've heard of offroaders who have crazy pinion angles, and this have the differential filled in a different mater than factory, swear by a bit of ATF in the gear oil to stop it from foaming.


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