Mobil 1 Myths/Rumors - Toyota Yaris Forums

craigq · 09-09-2007, 05:02 PM

IIRC, this discussion of Mobil 1 changing from a PAO/Grp IV to a Grp III oil started on Bob Is The Oil Guy; from there it spread through the rest of the Internet. There is a very large thread(s) on that site discussing it, a simple search will find it (search for chromatography will likely yield it, the threads have been locked for a while). There is a lot of theorizing in the threads about the composition, if it changed after Mobil was acquired by Exxon etc.

People asked and never received a statement from Exxon/Mobil of the percentage of PAO in the Mobil 1 product line. This can be expected as companies like to keep that information proprietary. It's likely that the different weights of Mobil 1 contain different percentages of Grp III/IV/AN/Esters/additives etc.

There were some gas chromatography analysis of certain Mobil 1 weights/products (15W50 and 10W30) and it came back sort of inconclusive; molecular weights of the Grp III molecules and the PAO molecules might've been overlapping. The tribologists stated it could be a Grp III with a dose of PAO. You're better off reading through the threads for yourself in case I got anything wrong.

The way oil companies are formulating Grp III's today is getting their performance on-level with PAO's. Only trending with used oil analysis will really tell you if the oil you've chosen is performing up to your expectations when all things are considered (price, oil change interval etc).

I've tabulated all of the UOA's from Bob Is The Oil Guy concerning the 1NZ-FE. Should we post it on this site to give people an indication of how a specific oil will perform ?

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09-09-2007, 05:02 PM	#6
craigq Drives: '07 Yaris, '12 GLI Join Date: May 2007 Location: Ottawa Posts: 100	IIRC, this discussion of Mobil 1 changing from a PAO/Grp IV to a Grp III oil started on Bob Is The Oil Guy; from there it spread through the rest of the Internet. There is a very large thread(s) on that site discussing it, a simple search will find it (search for chromatography will likely yield it, the threads have been locked for a while). There is a lot of theorizing in the threads about the composition, if it changed after Mobil was acquired by Exxon etc. People asked and never received a statement from Exxon/Mobil of the percentage of PAO in the Mobil 1 product line. This can be expected as companies like to keep that information proprietary. It's likely that the different weights of Mobil 1 contain different percentages of Grp III/IV/AN/Esters/additives etc. There were some gas chromatography analysis of certain Mobil 1 weights/products (15W50 and 10W30) and it came back sort of inconclusive; molecular weights of the Grp III molecules and the PAO molecules might've been overlapping. The tribologists stated it could be a Grp III with a dose of PAO. You're better off reading through the threads for yourself in case I got anything wrong. The way oil companies are formulating Grp III's today is getting their performance on-level with PAO's. Only trending with used oil analysis will really tell you if the oil you've chosen is performing up to your expectations when all things are considered (price, oil change interval etc). I've tabulated all of the UOA's from Bob Is The Oil Guy concerning the 1NZ-FE. Should we post it on this site to give people an indication of how a specific oil will perform ?