Two oil's Vis @40 and @100...what do the #s mean?

[rcy]

If I have two 0w20 oils and one is

Viscosity:
@ 40 C=38.87 @ 100 C=8.301
Flashpoint 238

and the other is

Viscosity @ 100°C, cSt (ASTM D-445) 9.0

Viscosity @ 40°C, cSt (ASTM D-445) 49.1

Flashpoint 228

...what can you tell me about these two oils?

Does a lower viscosity # at the given temperatures mean the oil is thinner at that temp? Thanks.

 

[unDummy]

Yep, the lower visc means the oil pumps better.

Because of your location, use the thinner one in the winter and the thicker one in the summer

 

[rcy]

Is the difference between the #'s huge? I mean, @40 the difference is 11 or so. Is 11 a huge jump as viscosity goes?

 

[Patman]

Which brand of oil is the one with the 38.8cst at 40c?

 

[Merkava_4]

Quote:

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Which brand of oil is the one with the 38.8cst at 40c?

---

Yeah that's got to be the thinnest oil I've seen yet.

Some day I'd like to find out where Marvel Mystery Oil comes in at.

 

[rcy]

It's the Honda 0w20 made by Idemitsu (it's from a Canadian dealership). I'm not even sure if it's a full synth or blend or what. It's only $6.99 at the dealer, so I doubt it's full syn.

 

[rcy]

I have the msds posted on another thread.

 

[johnbottilaw]

If a thin oil is what you are looking for, Torco SR-1 5w-20 is pretty darn thin.

7.37 & 42.69 respectively.

 

[Steve S]

Not enough to worry about .

 

[rcy]

The other oil is Amsoil 0w20.