Since there have been numerous discussions around various oils, I am just curious what the various tractor makes currently state in the "owners manual" for diesel oil ratings? Particulary, later models since 2001 as the newer oil classificatons have come out.... Do they state CI-4, CH or still just CF. Also, any particular test specifications such as Cummins, JD, Perkins etc... Other than weight of oil, do they give you very much guidance..? /forums/images/graemlins/confused.gif