I used to run it in my Cummins, not my PSD. It has a API CJ-4 cert so it will work fine in a PSD. Where are you located? How cold does it get in the winter?Does anyone know about the John Deere Plus II 15w40 engine oil!? Is it cheap? Does it work well in summer/winter? Runs good? How many miles before you have to change!? Anyone know? Thanks! :icon_ford: :woot: