I have been researching the same problem and wanted to try an oil based paint base and I cannot find it. I tried Benjamin Moore oil deep base. It looks green and dries to a green cast. More immportantly it takes a day and a half to dry. Perhaps there is a drying agent in the tints. Nearly everyone has stopped carrying oil based and gone to latex.
I looked up Sherwin Williams Duration and it is latex. Is the test ****hiller refers to a latex or oil deep base?