[sameyrasmea72]

I use rotellaT. I think it is for diesel engines but several people have convinced me it works wonders on old tired 350's. I think it has extra zinc in it. My mechanic who has been building big blocks for us since the 1970’s was adamant that I even use it on the 468 he just built me to break it in. Then he said to go with a synthetic oil after about 10,000 miles.