No, it's not myth, though most synthetics DO have some VI improvers, just not nearly as much as conventional oils. It's the inherently HIGH VI of the PAO and/or esters (and Group III, if it's a wax isomerate) that obviates the need for much VI improver in synthetics.quote:
Originally posted by userfriendly:
Is it just a myth that synthetic engine oils have no VI improvers?
If light viscosity base oils are cheaper to produce than heavier oils, a VI improved light weight synthetic would satisfy the product description.
Could for example a 10W30 "synthetic" engine oil be blended from the following?
40% group III or PAO ISO 10 base lube,
30% VII,
30% 10w group I/additive carrier package
That could be called a TRY-SYNTHETIC
Where are you coming up with this stuff from? "Bright stock" isn't used to classify any Group IV or Group V base oil. And I don't know of even a Group I based oil that has 15% VI improvers.quote:
Originally posted by userfriendly:
Ok, lets change that 30% figure to 15% bright stock and 15% VI improver.
Well, "us" doesn't need enlightening. You, however, can find all the info you need by reading many of the posts that are already on this forum. As an example, MolaKule posted in this very thread the percentages of VI improvers used in conventional oils, and they are nowhere near your hypothetical numbers.quote:
Originally posted by userfriendly:
Please enlighten us.
Sorry User. Maybe this will help.quote:
Still not enlightened
I've read thread after thread of people discussing the topic of what by defination constitutes a synthetic material.
Now here I have a couple of guys that are saying on one hand, that poly alfa olefins are a synthetic, but olefin copolymers are not synthetic.
I respect your point of view, and I may be just un-aware, but I was under the impression thatquote:
Originally posted by MolaKule:
---snip--
Brightstocks are mostly used in mineral oil gear lubes and greases.
--snip--
"Brightstock" is a solvent extracted Group I base oil.quote:
Originally posted by Robbie Alexander:
I respect your point of view, and I may be just un-aware, but I was under the impression thatquote:
Originally posted by MolaKule:
---snip--
Brightstocks are mostly used in mineral oil gear lubes and greases.
--snip--
MOROR OIL,
the low quality stuff we find...
IS made of BRIGHTSTOCK.
Are they not a BASE stock oils (brightstocks)?
I do believe that they still make engine oil out of bright stock.
If regular oils are not what is, or perhaps the question should be What are the most common base stocks for I or II's?
Wouldn't all I,II,III have to start from the same base stock? IS a Neutral base oil made from brightstock or a different animal?