New Mobil 1 C40 GT 0W-40

[CivicFK2TypeR]

Just because an oil analysis of the element concentrations looks the same, it is not the same oil. The C40 specification is intended exclusively for GT vehicles and includes OFM, which are not all visible in an oil analysis. It is about improved protection of the DLC coatings.

 

[travis8352]

If anyone finds this oil id be curious on the revision number on the back. Espx3 and espx4 both look the same elementally and on FTIR but the revision numbers are different so they are not the same oil in a different label. Id be curious what c40 GT is

 

[CivicFK2TypeR]

t is clear what it is, the application is on the label, there is nothing more to say. If you don't drive a Porsche GT, you don't need this oil. Does it hurt? I am not able to judge this, but I would not have any concerns about the use myself, I just lack the necessity. Mobil 1 has other good oils that have proven themselves over years.

 

[travis8352]

t is clear what it is, the application is on the label, there is nothing more to say. If you don't drive a Porsche GT, you don't need this oil. Does it hurt? I am not able to judge this, but I would not have any concerns about the use myself, I just lack the necessity. Mobil 1 has other good oils that have proven themselves over years.

But there will be an extra special feeling knowing you have a porsche GT approved oil protecting your engine lol

 

[CivicFK2TypeR]

Faith sometimes moves mountains

 

[Zee09]

I wish Mobil would include a volume knob with each purchase......

 

[buster]

This was taken from the LSJ video. Green is before/after viscosity shear stability test and blue is virgin oxidation value.

 

[OVERKILL]

This was taken from the LSJ video. Green is before/after viscosity shear stability test and blue is virgin oxidation value.

View attachment 263870

Interesting that the FS KV100 is nowhere near what the PDS shows (13.8cSt)

But, taking these results at face value, shear (%):
FS: 10.64%
ESP: 2.9%
C40: 3.88%
SC: 7.98%

 

[Indyxc]

User posted this on a Porsche GT3 RS FB Page.

500 track miles, 100 road miles. 600 total.

 

[OVERKILL]

User posted this on a Porsche GT3 RS FB Page.

500 track miles, 100 road miles. 600 total.

View attachment 264721

We obviously can't ignore the fuel, but that's 10.07% visc loss, which is considerably more than we saw with the KRL test.

 

[JAG]

We obviously can't ignore the fuel, but that's 10.07% visc loss, which is considerably more than we saw with the KRL test.

On the bright side, at least with some types of VIIs, it was found that the %HTHS loss was roughly 1/2 of the %KV100 loss. I did a quick search for the study and didn’t find it but did find this excellent discussion from 2012 on BITOG. Thread
It would be good if someone finds a study so we can see the dependence on the VII type. I suspect at least some of the more shear stable M1 0W-40 variants use star polymer VIIs or some other type more shear stable than M1 0W-40 FS uses.