what type of oil to use in a 225?

I don't believe it is necessary to use a additive, in a stock or mild build, once the engine is broke in. I use 10-30 "house" brand oil in all my engines, with out any problems. My 66 Barracuda has a cam that I have been using since 1979, it turns low to mid 13's in the quarter, and I rev between 6,000 and 6500 rpm. My 86 Toyota PU does not have roller cam followers, and has 378,000 miles on it. I think my Dippy has roller lifters, and my other engines don't have enough miles on them to brag about them.