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I don't care if it's certified, I have it in 3 of the 4 vehicles in the family fleet. I just know it works and here is why:
In 1992 I bought a GMC Sierra 1/2 ton extended cab short box truck new, at 66k the 4L60 trans literally exploded, huge bang and then no go. 1800.00 to replace. At 140k trans started shifting eratically. 1950.00 to replace. At 202k trans lost reverse and 1st. 1900.00 to replace. At 210K switched to Amsoil ATF and engine water temp dropped from 210 to just under 200 when towing and trans now has 108K on unit with just under 310k on engine and rolling chassis. Plus the uoa done on the fluid at 260k said fine for continued use, will do another uoa at 320k sometime in Nov 07. Fluid is still red and clean. For the cost about of about 100.00 for the oil and 18.00 for the filter and about 1 hour of my time, I'd have to say it was worth it. When the 4th vehicle is up for fluid change, it will get it too.