Originally Posted By: Quattro Pete
Originally Posted By: Gebo
Originally Posted By: lubricatosaurus
Originally Posted By: Gebo
I merely want to know the meaningful physical/chemical differences between these 2 oils.
Could be differences in the percentage of PAO (Group IV) vs. Group III (highly refined & modified crude oil).
Mobil 1 0w-40 was almost all-PAO about a decade ago, and then started putting in cheaper Group III basestocks to mix with around half-PAO and still "passing" all specs of course.
http://www.eclipse95.altervista.org/olio/mobil-1-new-live.pdf ...see slides 20-on for the story. Some extra high temperature deposits and cold flow properties was about the extent of the reduced performance from the looks of it.
This is the type of info I am looking for. THANKS! 45 pages.....
And how is it useful when it is outdated information?
I like history??? C'mon, can't I be the judge of how relevant a response is to MY question? Just because it means "nothing" to you...I probably am not nearly informed as you are.