HTHS of rotella oils

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I couldn't find this info, so I emailed shell.

Quote:


Allan,

I show that typical values are 4.1 for Shell Rotella T Multigrade Oil
SAE 15W-40 with Triple Protection Technology and 4.2 for Shell Rotella T
Synthetic Oil SAE 5W-40.

Thank you for your interest in Shell Rotella Products!


 
Good to know and now we understand why those oils don't seem to shear much... even in the big, shearing monster known as Power Stroke!
 
As to "average," allen5oh, that's true, but Rotella-T is probably the lowest cost and most readily available oil in the mix of oils worthy of using. Low cost and very good performance makes it a good value. That's what keeps me buying it.
 
I email Shell and asked what the HTHS was for CJ4 Rotella T 10w-30. See reply below.
Is the 3.5 HTHS the reason it doesn't meet the engery converserving GF-4?

"I show that, for Shell Rotella T Multigrade Oil SAE 10W-30 with Triple Protection Technology (the API CJ-4 formula), the specification minimum HTHS viscosity is 3.5. Typical values, of course, will run slightly higher than the manufacturing spec minimum.

Thank you for your interest in Shell Rotella Products!"

Regards,
Edward Calcote
Staff Chemist, Shell Lubricants US Technical Information Center http://www.rotella.com/
 
Quote:


sae min is 3.7. Mack and detroit diesel 4.2




I imagine other OEM's have similar requirements. So it's safe to say if an oil meets these requirements, the HT/HS is at leasts 4.2? Are there any OEMS that require a higher HT/HS rating?
 
Isn't HTHS related to viscosity? I'm not sure I understand how. I, for one, would appreciate a little wisdom on the topic. I see that gas rated oil is much lower in this area, especially oils that are "fuel conserving."
 
The way I understand it is the oils ability to withstand shearing.

You have to look at the whole picture though, as thicker oils will naturally tend to shear less.

Now this is just me talking out of my #@$%!, if anyone else actually knows "for a fact", please inform us!

But compare a few different syn 5w40's.

9000 14.0 at 100C, HT/HS 4.57
RTS 15.0 at 100C, HT/HS 4.2
Duron 15.5 at 100C, HT/HS 4.3
DEO 15.3 at 100C, HT/HS 4.2
Redline 15.1 at 100C, HT/HS 4.6

I think 9000 is the best oil in this regards, it's actually thinner at 100C, yet thicker under high stress conditions. Redline has a good HT/HS, but it starts as a thicker oil. Duron and DEO are very comparable.

Links (in order):

http://www.schaefferoil.com/datapdf/9000.pdf
http://www.shell.com/static//ca-en/downloads/shell_for_businesses/oils_lubricants/1-98.pdf
http://www.petro-canada.ca/pdfs/IM7944e.pdf
http://www.amsoil.com/StoreFront/deo.aspx
http://www.redlineoil.com/pdf/4.pdf
 
The High Temperature High Shear Viscosity Test is used to measures an engine oil’s ability to provide an effective adequate viscosity in high shear components such as the journal bearings and between the piston rings and cylinders under severe operating conditions.
The values obtained in this test provide an indication of the temporary shear stability of the viscosity index improver used in the formulation of multi-grade engine oils.
If the engine oil is not able to maintain an adequate viscosity when high engine operating temperatures and high shear rates are encountered wear to critical parts will occur.

From a doct. I had laying around.
 
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