I agree, everyone does have their own idea about oil. You should be fine with any name brand oil that advertises high zinc (zddp) content. Either synthetic or dino oil. I like Amsoil Z-Rod which is designed for older cars. I strongly recommend not to add STP oil treatment or any other oil additives, they just aren’t necessary if you use a good quality oil to begin with. Here’s why, years ago I was adding STP to my Road Runner simply because my engine was tired and I fell for their claims. I was planning a rebuild and figured it would by me some time. About a year and two or three oil changes later and I decided to do the rebuild. When we disassembled the engine at my friends shop (who built race engines for a living) he immediately reprimanded me for using STP oil treatment. I was shocked and asked how he knew I was using it, then he proceeded to point out this gray clay like build up in the corners and galleys throughout the block and heads. Apparently it’s most common reaction is to turn into this gray substance that separates out of the oil and settles into all available corners. He told me it was a waste of money and never use it again. Imagine what could happen over time as this stuff builds up, especially to modern engines that tend to have tighter tolerances and smaller oil return passages.