Originally Posted By: JAG
Since I mentioned the aniline point tests that I had done around year 2005, I found the results and they are below. I mis-remembered when I said above that German Castrol was tested.
M1 TDT was of CI-4+ formulation. All 3 oils were Mobil 1.
Aniline measurements:
5W-40 TDT (Turbo Diesel Truck): 276F
0W-40: 254F
10W-30 High Mileage: 248F
For comparison, Mobil's SpectraSyn Plus PAO of 6 cst viscosity has an aniline point of 257F (125C).
https://www.tri-iso.com/documents/exxonmobil_chemical_spectrasyn_plus_Brochure.pdf
Slide 7 in the following document shows where different base oils fall on the aniline point result range:
https://www.stle.org/images/pdf/STLE_ORG...pplications.pdf
Esters are shown down around 32F (0C).
My conclusion about the polarity of the base oil mixtures in the Mobil 1 oils tested. They were all very low in polarity.
Mobil 1, I think from what I gatthered here, uses about 15% AN and 2% Esterex (to help addpack solvent?), don´t know if any Diester or POE, if any, though. That would explain the different polarity you experienced.
Since I mentioned the aniline point tests that I had done around year 2005, I found the results and they are below. I mis-remembered when I said above that German Castrol was tested.
M1 TDT was of CI-4+ formulation. All 3 oils were Mobil 1.
Aniline measurements:
5W-40 TDT (Turbo Diesel Truck): 276F
0W-40: 254F
10W-30 High Mileage: 248F
For comparison, Mobil's SpectraSyn Plus PAO of 6 cst viscosity has an aniline point of 257F (125C).
https://www.tri-iso.com/documents/exxonmobil_chemical_spectrasyn_plus_Brochure.pdf
Slide 7 in the following document shows where different base oils fall on the aniline point result range:
https://www.stle.org/images/pdf/STLE_ORG...pplications.pdf
Esters are shown down around 32F (0C).
My conclusion about the polarity of the base oil mixtures in the Mobil 1 oils tested. They were all very low in polarity.
Mobil 1, I think from what I gatthered here, uses about 15% AN and 2% Esterex (to help addpack solvent?), don´t know if any Diester or POE, if any, though. That would explain the different polarity you experienced.