Oil zddp ?

mvh said
Mobil1 15W50 has over 1200ppm ZDDP, and it's available off the shelf at O'Reilly's.

I don't like additives because 1) you forget, and 2) when you top off the oil you don't get any.

I'd like to use that in my '68 383 as I have had good exp with all mobil 1 ...have you ever thought it was a little heavy in your experience using it?.