"basskisser" wrote in message
ups.com...

Gene Kearns wrote:
On 5 Jun 2006 09:33:12 -0700, "basskisser" wrote:



Paraffin occurs naturally to some extent in oil. My uncle was an
aviation machinist and being before they added alot of junk to oil, new
the differences in amounts of paraffin in California, Texas, and Penn.
crude

There are two types of crudes: naphthenic and paraffinic. Naphthenic
crudes contain very little paraffin. Paraffinic crudes have most of
the paraffin removed in a de-waxing process.

True, however, there is still paraffin in naphthenic crude. But not in
amounts significant to have to take out. Pennsylvania crude has a lot
of paraffin in it, for one. There are many, many types of crude from
around the world, all of them are different.



Aviation oils designed for recip. engines have very few additives... ,
they don't even contain detergents, relying on an ashless dispersant
package....

That's why in the '40's they were quite worried about where the crude
came from because of it's content.


But there are some zinc compounds added for rust prevention.