i also have used this refinery's
oil since 1978 starting with the kendall brand marketed as GT-1
oil, then the kendall name was sold to conoco-phillips. the GT-1 formula did not go with the kendall name.
this formula is now Brad Penn high performance
oil. i use the 20w-50 exclusively in my 427 and also sell the oil thru my company
http://www.origincorp.net/
we have 20w-50 in stock at 48.00 a case plus the ride, we are listed on the Brad Penn site as a PA dealer of their products.
regards, fred