I am using Amsoil 5w-30 synthetic in my 2003 corolla. Is it a good idea for me to add some Shaeffers #132 EP?. My reason for asking is I want to limit cold start wear to a minimum-even though I live in North Florida. But, more importantly, I don't want to cause harm to my engine by adding something to the Amsoil that would decrease its effectivness (Amsoil says to not add additives). I like what I have read about #132 EP and Moly additives and the fact that it provides startup and extra engine protection in case of oil failure. I would use Shaeffers blended motor oil, but I have 9 bottles of Amsoil to use first-I'm not knocking Amsoil. This is probably a non issue for my car, but, I am intrigued by this topic of motor oils and the best protection offered. I would appreciate any comments.