Went to napa the other day. Asked the guy for oil n filter for a 2006 ford f350. Powerstroke 6.0. He gave me the filter and. Five gal of of the new delo ck4 oil. Well after doing the oil change i went home and looked up the new oil. Seems ford doesnt want any ck4 oils in there engines, old or new. I wrote to chevron and there responce was that they back there product and if the engine fails that they would want a history of maintenace and an oil sample. That didnt make me feel any better. I asked a simple question to chevron. I asked if chevron was okay with using the new ck4 oil in a powerstroke. They didnt answer me. I asked them there take on fords stance. No answer. Now onto my next question. My boss has a bottle of rev x at the shop, should i use it. Will it help. Also should i buy a bottle of zddp max and just add it to the oil. Or should i dump the ck4 stuff and get the older cj4 stuff.