Oil for Overdrive Transmission

["DON SCOTT" <rowdon@sonoma-county.org>]

My father used to work for an air compressor company back in
the 1940s.  He always told me that there was a distinction
between "Western" oil and "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 like air compressors.  I used to seek out 30 wt
Western oil back in the '60s and '70s for my MG
transmissions.  It was cheaper too.