Wondering if anyone has ran the new ck4 oil in the 6.7. I've been using motorcraft oil since Ford had claimed the new ck4 oil isn't recommended but I'm starting to think it's a Ford ploy. I've been running the new ck4 oil in our JD tractors and the oil actually looks cleaner after a change. Haven't had any problems on older equipment just noticed one of the tractors seems to burn just a little more than it did with the cj4 oil. Also the oil being used is bulk delo XLE.