Originally Posted By: qship1996
well group 1,2,and 3 are all different levels of refined mineral oil, while group 4 and 5 are chemically composed.....you make your own conclusions
Here is Exxon/Mobils own take on the subject.
QUOTE
Motor oils typically are 75-85% basestock with the balance being additives. That’s why basestock quality is such a critical contributor to the performance of the final blended product. You’ll find out more about additives below.
There Are Four Different Types of Motor Oil Base Stocks
We know that basestock composition has a significant effect on the overall performance of motor oil. There are four different types of base stock used in the motor oil market today.
Group 1 - Conventional - Mineral oil derived from crude oil
Group 2 - Hydroprocessed - Highly refined mineral oil
Group 3 – Severe hydroprocessed - Ultra refined mineral oil
Group 4 – Full synthetics (chemically derived) - Chemically built Polyalphaolefins (PAO).
As it infers Groups 1 – 3 basestocks are derived from crude oil pumped from the ground whereas Group 4 basestocks are chemically derived, most often from ethylene gas, and contain none of the contaminants present in mineral oils. Just as distilled water is pure water derived from gas so Group 4 basestocks are pure oils derived from gas.
END QUOTE
Hope you find the above quote from Mobil educational and enlightning.
I see a lot of inferring that Group IVs are superior without actually saying it. The reason they don't say it outright is because it's not true.
The Group III vs. Group IV arguments are ridiculous.
Group IV oils are usually made from things that did not start as oil. Group III oils are made from things that started as oil. Does it matter?
Yes, Group III is cheaper to make but the process to make Group III is much newer than the process to make Group IV.
Has anyone been able to prove that the best Group III oils are inferior to the worst Group IV oils? If Group IV was that superior then no Group III oil should be able to stand up to any Group IV oil. As it stands, Pennzoil Platinum and Ultra are Group III oils that many on this board consider superior to the competition that contains Group IV.
Can this topic finally die?