I have seen an older listing of the various grades of oil based
primarily on the geographic location. So maybe this explanation below
could be right on the money. These days modern refineries must
eliminate the distinction. On a slightly tangential note, different
grades of coal are still extracted from different parts of the country.
I have seen an old brewing manual that distinguishes the potential btu
output of West Virginia versus Colorado Coal.
I'll be darned. Once you think you've heard 'em all....... ;^)
DON SCOTT wrote:
> My father used to work for an air compressor company back in the
> He always told me that there was a distinction between "Western" oil
> "Eastern" oil (California vs. Pennsylvania?). The oil that they used
> for compressors was Western oil- not as capable of withstanding very
> high temperatures, but slipprier, so better for light applications
> air compressors. I used to seek out 30 wt Western oil back in the
> and '70s for my MG transmissions. It was cheaper too.