all conventional 5w20 is what is called group 2+, meaning it didn't come out of the ground that way, but not processed enough (heat, temp etc) to be called a group 3. All conventional 5w20 SM oils are excellent oils. Pennzoil has the art of making a first class oil down to a science. For the utmost, buy Pennzoil full synthetic, for ultra long OCI, 10,000k or more. If you change UR oil every 5000k, then conventional oil will work exactly the same.