NOACK of ATF vs Motor Oil

[Ferb]

I was checking out the specs of Schaeffer's 204S and it mentioned a NOACK D-5800 of 2%. How on earth does this happen??

I figured a 100% PAO/Ester based would be less apt to evaporate. But even the 100% synthetic Schaeffer 5w-30 is up at 9%.

MolaKule, chance you can explain this?

ferb!

 

[MolaKule]

There are two methods of measuring volatility loss as shown below.

Volatility % Evaporative Loss @ 700°F (ASTM D-2287)

NOACK Volatility (ASTM D-5800) % Evaporation Loss @ XXX °C


Normally, the ASTM D-5800 is measured at 250 C, but we don't know what the oil temp was for the #204S test.

I do know the 204S has a Viscosity Index of 196, which tells me that their base oils, VII, and other adds are pretty darn stable. One add which will enhance thermal stability is the anti-oxidant additive.

 

[Ferb]

So essentially, the 204S could have been tested at like 100 F and hardly evaporate at all.

I thought the D-5800 specified 250 C. Or is the D-5800 the protocol, and the degree is up to the tester?

ferb!

 

[TooSlick]

It's probably a misprint and should have said 12% ....

For example, the Amsoil 100% synthetic ATF has a Noack of about 11%, as I recall. These are typically 0w-20 or 5w-20 fluids - there is no way they'd have an evaporate rate that low, even if they were made entirely from diesters.

Tooslick

 

[Ferb]

Thanks much guys. I'm starting to miss university already, so i'll probably be bombarding the board with my questions.

thanks again.

ferb!

 

[MolaKule]

Here's the scoop and the spec IS correct. The testing temperatures are different for different fluids. ATF's are measured at 150 C whereas engine oils are tested at 250 C.

For ATF's, the NOACK Volatility (ASTM D-5800) % Evaporation Loss @ 150 °C (302 F).

For ENGINE OILS,
the NOACK Volatility (ASTM D-5800) % Evaporation Loss @ 250 °C (482 F).

The #204S base oil is severely hydrofinished Group I paraffininc base oil with a superb add pack.

 

[MolaKule]

I forgot to mention that the 204S has 13% PAO added to the base oil.