Another Mobil 1 Question

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spasm3

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I meant to get this question in before the thread was closed. On the mobil 1 web site, the Mobil 1 ep oils 5w 30 has a 40c cst of 64.4 and 100c cst of 11.2. The 10w 30 Ep has a 40c cst of 64.1 and 100c cst of 10.5.

Is this correct? why is the 5w 30 thicker cold and hot than the 10w 30?? I'm Wondering it the mobil website got the two oils backwards?
 
I don't see a problem.

The 5w-XX and 10w-XX numbers have nothing (or very little) to do with viscosity at 40C. And as for the viscosity at 100C, well, 10.5 and 11.2 are both within the allowable range for a 30-weight, so again, no problem there.
 
I'm gonna take a guess that 5w30 is alittle thicker hot because it is factory fill in high revving cars. Such as Corvettes and whatever else.
 
Originally Posted By: spasm3
no not a problem , i'm just wondering why you would not reverse the labels on those oils?

Because the 5w-30 has a pour point of -45C while the 10w-30 has a pour point of -39C, as per the spec sheet.
 
The EP part of those oils means it's 'extended performance'.
It on the thicker side of the range so it can go longer; hence it means 'extended'.
As Quattro Pete said, the pour point is a bit more important for the 5W.
 
Originally Posted By: spasm3
no not a problem , i'm just wondering why you would not reverse the labels on those oils?


You are looking at viscosity at 40 degrees and 100 degrees. The "w" stands for winter. Does 40 degrees or 100 degrees sound like a winter temperature? You are looking at the wrong part of the viscosity curve.
 
spasm - Oil # designations are a range, not an exact finite spec., as you can see.
It initially does seem odd that the 10-30 would be thinner than the 5-30, but it is what they chose when they made it.
Like mentioned, at 0deg F the '5' and '10' first # would show the '5' to be thinner there.
 
Originally Posted By: spasm3
I meant to get this question in before the thread was closed. On the mobil 1 web site, the Mobil 1 ep oils 5w 30 has a 40c cst of 64.4 and 100c cst of 11.2. The 10w 30 Ep has a 40c cst of 64.1 and 100c cst of 10.5.

Is this correct? why is the 5w 30 thicker cold and hot than the 10w 30?? I'm Wondering it the mobil website got the two oils backwards?


Spasm3, No the Mobil 1 figures are correct. The 10W-30 EP oil is in fact heavier at normal operating temp's and above because it's HTHS vis is higher than that for the 5W-30 EP. You'll notice the same lower KV100 spec' and higher HTHS vis with the regular M1 5W-30 and 10W-30.

The kinematic measure of viscosity does not correlate well will the operational viscosity in an engine, HTHS vis is a very accurate measure which does correlate well.
The following thread might help explain it for you.

https://bobistheoilguy.com/forums/posts/2018835/
 
Originally Posted By: dwendt44
That's 40ºC, which is equal to +32ºF.

Whatever you're smoking, I want some!
55.gif
 
Originally Posted By: BobFout
Originally Posted By: dwendt44
That's 40ºC, which is equal to +32ºF.


32F is 0C.
Darn metrics!!
 
Originally Posted By: Steve S
Originally Posted By: BobFout
Originally Posted By: dwendt44
That's 40ºC, which is equal to +32ºF.


32F is 0C.
Darn metrics!!


There is no metric involves here.
You mean: Darn International System Units!! ... compare to imperial measurements.
 
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