It's that time of year and I have to change oil in my Duster. I'm out of my stock of old Valvoline premium blue and EOS I used to run. I wanted to know whats the best for a mild 440 with a solid MP .528 cam? I know zinc is a high priority but i'd like to be able to get something off the shelf and not have to order from online. Are there any additives that are worth using? Thanks