Amsoil Question

[Steve S]

Mobil 1 would be the Amsoil that won't thicken.

 

[buster]

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Mobil 1 would be the Amsoil that won't thicken

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Good point. And then throw Mobil 1 Extended Performance into the mix you really have an oil!

 

[Mamala Bay]

Does Mobil thin out in viscocity in extended OCI. Would that cause more wear as we've seen Amsoil tends to thicken slightly at 10-12K OCI but wear rates show excellent results.

 

[railball]

I read this today and wondered if is a reason oil thickens up so much. Particles, especially catalytic metal particles like copper, iron and lead increase the rate at which oxidation occurs. Particles also strip the oil of its polar additives, including antiwear additives, extreme pressure additives, rust inhibitors and dispersants. Also, numerous very small particles in stable suspension can cause the oil's viscosity to increase.

 

[Bill]

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Posted in the interests of accuarcy

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[MolaKule]

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The higher HTHS of the Amsoil should result in lower wear in the bearings and rings/cylinder area. That is at least according to the results of a study posted by Molecule a short time ago on the effects of HTHS on wear.

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I don't agree with this. This would imply that using heavier vicosity oil is better and that hasn't proven to be the case.

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I think you may have missed the salient points of the matter.


In general (general trending), the higher the viscosity the better the HTHS.

However, using other criteria, a heavier viscosity oil could shear like crazy and have a low HT/HS number.

Much depends on the specific formulation.

The HT/HS testing was developed to create a test that better correlated high temperature shear with actual wear.

 

[TallPaul]

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Originally posted by railball:
I read this today and wondered if is a reason oil thickens up so much. Particles, especially catalytic metal particles like copper, iron and lead increase the rate at which oxidation occurs. Particles also strip the oil of its polar additives, including antiwear additives, extreme pressure additives, rust inhibitors and dispersants. Also, numerous very small particles in stable suspension can cause the oil's viscosity to increase.

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What a coincidence, Noria's Filtration Tips Newsletter just arrived today and addresse your comment:How Partical Contamination Affects Oil :

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Particles, especially catalytic metal particles like copper, iron and lead increase the rate at which oxidation occurs. Particles also strip the oil of its polar additives, including antiwear additives, extreme pressure additives, rust inhibitors and dispersants. Also, numerous very small particles in stable suspension can cause the oil's viscosity to increase.

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EDIT: OK my goof. I didn't realize you were quoting the Noria newsletter. No wonder it looked so familiar.

Please quote your source next time.

 

[buster]

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I think you may have missed the salient points of the matter

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I did. I went back and looked at it again. My mistake.

What throws me off is M1R and that 76 Racing oil. Why would Mobil make a racing oil with a HT/HS of 3.0? Anyone know the answer to that?