<<
Just went out and checked a 5qt container of Mobil 1 which was
purchased inside of two weeks ago. Still marked "Tri-Synthetic".
>>

That is their old stock, SJ rated oils.


<<
I'd be interested to hear if anyone has detected a similar change
in Mobil Delvac 1, or in the Caterpillar synthetic diesel oil which is
reportedly put together using the Delvac 1 basestock plus an
even tougher additive package.
>>

I have not seen any change on Delvac 1. But the Delvac 1300 Super has been cheapened up in base stocks. It has the smilar deteriation in pour point, etc.


<<
If Shell would cut some volume discounts, I'd be happy to give
their Rotella synthetic a whirl. I'll have to write them as well.
>>

Or the Chevron 5W-40 synthetic (CH-4 rated).