Since the Quote function isn't working, I'll have to do the old fashioned way.
"Lets use an example when a manufacture specified a preference to a single weight engine oil instead of the more common suggested multi-grades. Would a way around this single grade requirement be the use of a synthetic that does not have VI improvers, but passes a multi grade test?"
Yes! Check out the Street and Racing oil specs for Redline on Redlines web site.
"Since due to the fact synthetics have such a high VI, can they be classified as both a single grade and as a muli-grade in the same container?"
Yes! But the label would probably not read that way. Check out the Street and race oils for Redline on Redlines web site.
"Is a 5W40 synthetic a straight grade, a multi-grade or both?"
It could be a multigrade with a mix of various viscosity POA's for example, or it could be a single viscosity PAO with VII's, which would still make it a multigrade. Much depends on base oils and base oil viscosity availability and economics. The multigrade classificiation is very dependent on how the resulting formulated oil performs at various temperatures, or its Viscosity Index.
For example, I could use a combo 4/100 (at 100 C) vis PAO, or use a combination 8/40 vis PAO to make either a starting 40 OR 50 weight base oil, depending on the ratios of each. For the 40 weight base oil, the 4/100 would have a - 60 C pour point, a flash point of 230 C, a Noack of 10.4%; whereas the 8/40 vis mix would have a -51 C pour point, a flash point of 272 C, and a Noack of 3.2%.
We haven't yet included the effect of low and high viscosity esters, nor have we included the effect of the additives on the viscosity or VI.
[ June 27, 2003, 06:08 PM: Message edited by: MolaKule ]
