OK..I need some feedback. Pretty big chunks of cast iron and steel severe sliding wear in my Vortec V6 1998 GMC Sierra oil sample. I'm thinking of switching to Mobil 1 0W40 SuperSyn for extra wear protection and thicker oil wedge. Any responses? You think this will void my warranty if I switch? p.s. slow leak of glycol into the engine as well, which will be repaired under Optimum Warranty.