looking for opinions on kendall, I know its made by conoco and the specs look good but dont see it mentioned here, I tried searching and came up with nothing but maybe I am not doing it right. I work for a diesel fleet and we just got some 6.0 liter gmc gas engines using 5w30. we use kendall 15w40XA in the diesels and I would be able to get the 5w30 GT1 synthetic blend from the same supplier.