I will be doing my first Auto-rx treatment next week on my 70K mile '98 Jeep Grand Cherokee(ZJ) I6. I've been using Amsoil synthetic oil for the past 30K miles but used dino oil for the first 40K miles. So I'm sure I have sludge in the engine and that's why I'm doing it. I ordered 2 bottles since I need to use 14 ounces. I'll use the remaining 10 ounces as a 3 oz. maintenance dose for future oil changes. My question is how often should we be doing a full treatment of autorx? Every 15k miles or so? Also, is a 3 oz. maintenance dose necessary at every oil change if using synthetic oil?
Thanks.
Thanks.