tried searching but no luck...Anyone have Pennzoil Conventional 5w20 used oil analysis or voa especially in honda 2.4 applications? Everyone here says I am waisting my money on synthetic with my short trips and 3000 mi oci. So after I run through my PU and PP, i just may give Pennzoil conventional a try. Is it 100% safe to switch from synthetic to dino, then back to synthetic?