Where is a temperature vs viscosity graph of...?

[biomed_eng_2000]

Where can I find a temperature versus viscosity graph of different engine oil weights such as 0w30 and 10w30?

I googled images and searched here but perhaps my searching skills are wanting.

Thanks!!

 

[brandini]

It's different for every oil.

 

[jstutz]

are you looking for this?
http://www.widman.biz/Seleccion/Viscosidad/Conversiones/Graph/graph.html

 

[pcfxer]

Neat, but with that graph it proves that Mobil 1 0w-40 isn't a 0w at all and is thicker than all of Amsoil's 5w oils.

 

[d00df00d]

0w just means that the oil will continue to flow at temperatures that would turn those 5w oils into molasses. It has nothing to do with viscosity higher up the temperature range.

GC 0w-30 is the same way: at most temperatures, it's thicker than most 5w-30s and even some 10w-30s.

 

[jstutz]

Keep in mind that the accuracy is worse the lower in temp you go. I believe they even state that anything under 0 could be off. This is due too the different basestocks, VII ect. Personally, i dont care becuase I will never see less than 0F and that will be very very rarely. Really to me is showes how insignificant the difference between 5w30 or 10w30 really are unless you are operating in very very cold conditions.

 

[Gary Allan]

Quote:
0w just means that the oil will continue to flow at temperatures that would turn those 5w oils into molasses. It has nothing to do with viscosity higher up the temperature range.


I'd rather say that it will have no more than the maximum appearance of a 5w @ 5F lower in temp if we're looking at the CCS numbers.

 

[OVERKILL]

Originally Posted By: pcfxer
Neat, but with that graph it proves that Mobil 1 0w-40 isn't a 0w at all and is thicker than all of Amsoil's 5w oils.


It is?

Lets see:

-50C:
M 1 0w40: 71373.7
SSO 0w30: 69002.4
ASL 5w30: 80868.5

-45C:
M 1 0w40: 36800.0
SSO 0w30: 33793.2
ASL 5w30: 39279.5

-40C:
M 1 0w40: 19994.2
SSO 0w30: 17569.0
ASL 5w30: 20265.4

-35C:
M 1 0w40: 11388.7
SSO 0w30: 9637.3
ASL 5w30: 11037.2

Oh look, there we go, at -35 is where we are close to parity. Any temperature below that, M1 0w40 is thinner.

I also put TDT 5w40 in there and at -35, it is 32292.6..... I'm scared now! LOL! I may do an M1 0w40 oil change..... I'm almost at 10,000Km anyways.

 

[Gary Allan]

The MRV is measured @ -40 for a 0w and @ -35 for a 5w.

Given the numbers you've come up with there, it looks like ASL is as much a 0w as M1

 

[OVERKILL]

Originally Posted By: Gary Allan
The MRV is measured @ -40 for a 0w and @ -35 for a 5w.

Given the numbers you've come up with there, it looks like ASL is as much a 0w as M1


Below -40C, SSO and M1 0w40 are a lot closer than either are to ASL 5w30 however.

 

[Gary Allan]

There's no bottom to the 0w spec. Maybe they'll come up with a 00W

 

[OVERKILL]

Originally Posted By: Gary Allan
There's no bottom to the 0w spec. Maybe they'll come up with a 00W

HAHAHHHAHAHHHAhAHA

 

[OVERKILL]

After graphing M1 0w40, ASL 5w30 and SSO 0w30, there really isn't a big difference between M1 0w40 and SSO 0w30 at any of the cold-start temps.

And ASL 5w30 is right on-par with M1 0w40 (or perhaps M1 0w40 is right on par with ASL 5w30) right down to -35C, after which the ASL becomes heavier than M1 0w40.

 

[Gary Allan]

Quote:
After graphing M1 0w40, ASL 5w30 and SSO 0w30, there really isn't a big difference between M1 0w40 and SSO 0w30 at any of the cold-start temps.


Well, I think I'd be negligent in not pointing out that SSO's numbers are BETTER than M1 0w-40 at all those temps ..

..not that it really means much... (I love it when I see this) "I'm just sayin' "

 

[OVERKILL]

Originally Posted By: Gary Allan
Quote:
After graphing M1 0w40, ASL 5w30 and SSO 0w30, there really isn't a big difference between M1 0w40 and SSO 0w30 at any of the cold-start temps.


Well, I think I'd be negligent in not pointing out that SSO's numbers are BETTER than M1 0w-40 at all those temps ..

..not that it really means much... (I love it when I see this) "I'm just sayin' "

Hey, somewhere between -50C and -55C, M1 0w40 is thinner than SSO, and all lower temps. That in itself is weird.

 

[mechanicx]

I had always thought that a 0W or 5W viscosity rated oil met the nominal viscosity of that wieght oil at 0 Celsius. I guess it's not that simple. I wonder just how accurate that windman site's calculator graphs are in predict an oils actual viscosity curve?

 

[OVERKILL]

Originally Posted By: mechanicx
I had always thought that a 0W or 5W viscosity rated oil met the nominal viscosity of that wieght oil at 0 Celsius. I guess it's not that simple. I wonder just how accurate that windman site's calculator graphs are in predict an oils actual viscosity curve?


That is a very good question. And one I am not qualified to answer.

 

[OVERKILL]

Originally Posted By: mechanicx
I had always thought that a 0W or 5W viscosity rated oil met the nominal viscosity of that wieght oil at 0 Celsius. I guess it's not that simple. I wonder just how accurate that windman site's calculator graphs are in predict an oils actual viscosity curve?


You bring forth an interesting question though, and here's why:

M1 TDT 5w40 shows an MRV of 25,400cSt at -35C on the data sheet. Yet using Widman's calc, I get 32292.6......... That's a pretty big difference!

 

[mechanicx]

Originally Posted By: OVERK1LL
Originally Posted By: mechanicx
I had always thought that a 0W or 5W viscosity rated oil met the nominal viscosity of that wieght oil at 0 Celsius. I guess it's not that simple. I wonder just how accurate that windman site's calculator graphs are in predict an oils actual viscosity curve?


That is a very good question. And one I am not qualified to answer.


I'm not either that's why I ask

. I had always thought that SAE 5W30 meant it met a nominal viscosity of a 5 weight at 0C or 32F and 30 weight at 100C or 212F

.

 

[OVERKILL]

Originally Posted By: mechanicx
Originally Posted By: OVERK1LL
Originally Posted By: mechanicx
I had always thought that a 0W or 5W viscosity rated oil met the nominal viscosity of that wieght oil at 0 Celsius. I guess it's not that simple. I wonder just how accurate that windman site's calculator graphs are in predict an oils actual viscosity curve?


That is a very good question. And one I am not qualified to answer.


I'm not either that's why I ask

. I had always thought that SAE 5W30 meant it met a nominal viscosity of a 5 weight at 0C or 32F and 30 weight at 100C or 212F

.


Yup, that was my understanding as well. That the oil would emulate a straight 5-weight at 0 degrees Celcius, whilst being a 30W at 100C.

Of course the grades themselves encapsulate a somewhat broad range, so the lack of specificity is in itself, part of the confusion.