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  #71  
Old 8th October 2019
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Originally Posted by bustert View Post
engine oils are made from various base oils as defined by the American Petroleum Institute (API). There are five categories of base oil: Group I, II, III, IV, and V. Groups I-III are refined crude oil. Group IV is polyalpha olefin, and Group V is “other.” Search API’s web site to understand the differences.

The words “synthetic” and “semi-synthetic” do no appear in any API literature, and there is no universally accepted definition. These are purely marketing terms. Without going into the history, “synthetic” engine oil is generally made from Group III, IV, or V base oil. Yes, Group III oil can be sold as “synthetic”, because it is highly refined and chemically modified to such as extent as to be “synthetic,” i.e. not occurring in nature.

Synthetics do perform better in certain tests and in real life. They have better thermal stability, better shear stability, they have more Newtonian fluid characteristics (exhibit higher viscosity under shear conditions), better low temperature behavior, and lower volatility.
Despite numerous UOAs that say otherwise. Including everyones favorite here M1v-twin. Out performed by a mineral oil even at extreme heat and 5000 miles.
Designer MC oil is good for one thing tho...emptying your wallets.
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  #72  
Old 8th October 2019
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well, if i remember right, a ocean tanker went nearly 500,000 hours on shell rotella which was a petroleum base oil. we went well over a year on petroleum base oil, changing only on analysis reports. the whole KEY to the issue is maintenance.
my 1974ch had everything imaginable in it and easily survived, def not sticking to weights and never a drop of syn oil.
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  #73  
Old 8th October 2019
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never a drop of syn oil.
Amen. These newer blends since 1970's work just fine and dandy.
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  #74  
Old 11th October 2019
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Originally Posted by Tomcatt View Post
And what happened was that many oil companies took this as a green light to abandon Group IV base oil and use (cheaper) Group III while still calling their product "Full Synthetic". My cynical side suspects they did this at no price reduction to the consumer as it's still "Full Synthetic"...
And Mobil 1 jumped on this band wagon as well after complaining about Castrol using group 111

A natural evolution of the formulation

The Mobil 1 formulation strategy has always been based on selecting the best components available. We now have the very high quality Group III+ base stock, �Visom� exclusively available to ExxonMobil. As we developed the Mobil 1 ESP technology we found that combining Visom with PAO could deliver a formulation of equivalent performance to an all PAO formulation.

Competitive advantage

Visom is the only non-PAO stock that can deliver the required performance to formulate a 0W grade oil that meets European OEM engine oil specifications. Visom is not available to our competition.

To support Mobil 1 growth

Global PAO capacity is limited. As we quickly approach this limit, new base stocks must be explored to ensure we can support the continued growth of the Mobil 1 family of products.

To ensure continuity of supply

As we saw with the 2005 hurricane, the more flexibility we have in our formulations, the better placed we are to withstand disruption to our supply. We can balance PAO and Visom supply fluctuations to ensure we can always deliver the final product to our customers.

To maintain market relevant pricing

As PAO supply has tightened globally, raw material costs have increased substantially. In the future, an exclusively PAO formulation may be priced out of the market or result in significant margin erosion.

To prepare for next generation basestocks (GTL)

Commencing 2010, the next generation of base stocks derived from Natural Gas (Gas To Liquids) will enter the market. These high quality basestocks will arrive in substantial quantities and will probably be used in the majority of competitive premium formulations. Visom is viewed as a precursor of GTL, and hence it�s use now in our flagship formulations eases our transition to a GTL world, and helps us understand how to maintain flagship performance using these high quality non-PAO basestocks.
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