Well it's not true.:doh:What have been using all along?
Some folks say syn oil in a not new engine could cause it to start leaking when it never leaked before. Who knows if that's true, but it sounds feasible. Here in FL (as are you) I use conventional 10w30 or 10w40 in my 350 crate motor. I pay more attention to the quality of the filter.
Yes, 1200 ppm is considered good for non roller engines. I've been using Rotella 15w 40 in my vette which has 1200 ppm. I just called the Shell contact number, and the rep assured me that the zddp level is still the same.without opening a can of worms, on older motors there is a concern that current day oils dont have the ZDDP - zinc levels needed to properly prevent engine wear. Some of the synths do have levels of ZDDP that are acceptable eg. mobile one , Amsoil etc. If I recall correctly + 1200 or more is a safe amount.