Oil is NOT thinner when cold.

[edhackett]

It looks like some people are still confused. It really was (is) as simple as measuring the viscoity of an oil at 0F and stating that an oil that met certain viscosity specifications at 0F met the requirements for a 5W, 10W, or 20W oil.

SAE 10 oil with a VI of 95 will have a viscosity of about 35 SUS @ 210F and 3442 SUS @ 0F. SAE 30 oil is about 62 SUS @ 210F.

A multigrade oil that measured 3440 SUS @ 0F and 62 SUS @ 210F was a 10w30 oil.

In kinematic viscosity that would be about 740 cSt @ -18C and 11.5 cSt @ 100C.

Thicker when cold, thinner when hot, no space-time distortions nescessary.

Ed

 

[Auto-Union]

...but what KIND of (reference) oil has exactly a VI of 95 and a 740cSt kinematic viscosity at +0f but a +212f visc of 11.5?

I have no problems with that old definition, but it's no longer in use and has gotten quite mangled over time.

 

[edhackett]

Viscosity is not referenced to anything. It is a direct measurement of a physical property at a specified temperature.

Ed

 

[Winston]

Wow, 4 Pages and no one posted any example data. This should clear it all up.

Here are some viscosity numbers at various temperatures for straight weight oils SAE 10 and SAE 30, as well as a multigrade oil 10W30. Important things to note:

1. At -30C the viscosity of the 10W30 and the SAE 10 are similar.
2. At 100C the viscosity of the 10W30 and the SAE 30 are similar.

code:

---

Temp SAE 10 10W30 SAE 30

-30 C 16859 17486 41940

-20 C 4456 5292 10423

-40 C 47.2 73.5 82

100 C 7.0 10.8 10.3

Visc Indx 105 135 108

---

 

[G-MAN]

Interesting. That 10w with a vis of 7.0 is a mid 20 weight.

 

[bruce381]

to confuse more add the word "straight wt" or
"Multi wt" when talking about oils maybe that will help.

How about this? i blend a 10/30 but do not "qualify" it with CCS, then can I sell it as a Straight 30 wt?

bruce

 

[1sttruck]

Anyone have any charts of different oils handy ? It'd be nice to see how different oils measure at a 'common' range of temps like -25F, 0F, 25F, 50F, 100F, 200F, 300F

 

[Gary Allan]

quote:

---

Originally posted by G-Man II:
Interesting. That 10w with a vis of 7.0 is a mid 20 weight.

---

I agree. That looks like a 10w (10w-20) That's what 10w oil is

SAE Viscosity Grade SAE J300 10W
API Service Category SAE J183 CF
Gravity Specific @ 60°F(15.6°C) ASTM D-287 0.877 °API 29.7
Pounds per Gallon 7.33
Flash Point, °C(°F) Min. ASTM D-92 205(400)
Pour Point, °C(°F). ASTM D-97 –30(-22) ColorASTMD-15004.04.04.5
Viscosity
@ 40°C, cSt ASTM D-445 38
@ 100°C, cSt ASTM D-445 6.5
Viscosity Index ASTM D-2270 120
High Temperature/High Shear Vis., cP ASTM D-4683 2.4
Low Temperature Viscosity Vis (cP) at Temperature (°C) ASTM D-2602 7,000 max @-25
Low-Temperature Pumping, cP. (°C) ASTM D-4684 60,000max @-30
Sulfated Ash Content, % wt. ASTM D-874 Shear Stability, % Vis Loss DIN Method NA
Total Base Number ASTM D-2896 6 min

 

[G-MAN]

quote:

---

Originally posted by Gary Allan:

quote:

---

Originally posted by G-Man II:
Interesting. That 10w with a vis of 7.0 is a mid 20 weight.

---

I agree. That looks like a 10w (10w-20) That's what 10w oil is

SAE Viscosity Grade SAE J300 10W
API Service Category SAE J183 CF
Gravity Specific @ 60°F(15.6°C) ASTM D-287 0.877 °API 29.7
Pounds per Gallon 7.33
Flash Point, °C(°F) Min. ASTM D-92 205(400)
Pour Point, °C(°F). ASTM D-97 –30(-22) ColorASTMD-15004.04.04.5
Viscosity
@ 40°C, cSt ASTM D-445 38
@ 100°C, cSt ASTM D-445 6.5
Viscosity Index ASTM D-2270 120
High Temperature/High Shear Vis., cP ASTM D-4683 2.4
Low Temperature Viscosity Vis (cP) at Temperature (°C) ASTM D-2602 7,000 max @-25
Low-Temperature Pumping, cP. (°C) ASTM D-4684 60,000max @-30
Sulfated Ash Content, % wt. ASTM D-874 Shear Stability, % Vis Loss DIN Method NA
Total Base Number ASTM D-2896 6 min

---

What brand 10w oil do these specs belong to?

 

[bruce381]

delo? no TBN to low, dark color tho 4.0-4.5 is brown, some off brand? PCMO Not HDEO.
bruce

 

[Winston]

quote:

---

Interesting. That 10w with a vis of 7.0 is a mid 20 weight.

---

OK the point of the chart is to help clarify the issues of the discussion on the last four pages. Now you are nitpicking the viscosity numbers?

You spent 4 pages trying to explain multiweight oils without any viscosity examples.

This is where I got the 10W oil info.

SAE 10

I tweaked the VI to make the -30 viscosity closer to the 10W30.

If you want viscosity at various temps for a given oil. This page has a nice, easy to use viscosity calculator.

Viscosity Calculator

I use it to calculate viscosity my normal starting temps. (50-60degF). Interestingly, you will find that many 10W30 oils are thinner than many 5W30 oils at all temps that my vehicles operate. That first number in multiweight oils is only relevant at very cold starting temps.

 

[G-MAN]

You tweaked the VI? In other words the VI you posted isn't really the VI of the oil.

 

[Winston]

quote:

---

You tweaked the VI? In other words the VI you posted isn't really the VI of the oil.

---

Yes. What's your point?

 

[G-MAN]

quote:

---

Originally posted by Winston:

quote:

---

You tweaked the VI? In other words the VI you posted isn't really the VI of the oil.

---

Yes. What's your point?

---

You should go to work for Amsoil.

 

[Winston]

I lowered the VI from 110 to 105. This could of easily been done through the selection of different base oil.

Again, what is your point?

My point with my original post was to help clarify the four page discussion with viscosity data.

You are going to wear out the

button.

 

[toocrazy2yoo]

 

[Gary Allan]

quote:

---

Originally posted by G-Man II:
What brand 10w oil do these specs belong to?

---

PZ LL HDEO 10w

All SOPUS product data sheets USA

 

[Auto-Union]

SAE visc grades reference a 95 VI oil.

 

[Gary Allan]

quote:

---

Originally posted by Gary Allan:

quote:

---

Originally posted by G-Man II:
What brand 10w oil do these specs belong to?

---

PZ LL HDEO 10w

All SOPUS product data sheets USA

---

Other interesting "10w(-20)" oils

American Refining Group HDEO 10w

and

ARG 10w(-20)..specifically for passenger cars.

They appear to be different products