With all the problems with the oil and wiping out cams because the manufacturers removed the zinc from the oil for today's cars,I know many years ago I read an article about Marvel Mystry Oil..And the people from Marvel were asked what is the mystry additive.and they wouldnt say..So an independant lab did an analisis of it and I know I read that the mystry stuff was zinc..I'm 90% sure of it..but it was a real long time ago..Can anybody verify that ???I would be a great and inexpensive additive for the cam- zinc problem