I was reading through the acronym thread and I noticed under M1 it said Mobil one and then in parenthesis it said all M1 oils are synthetic. I'm looking for validity on this as I just put some M1 super 5000 in one of my cars as a cheap oil for a month. I thought it is dino oil since it doesn't say synthetic anywhere on the bottle. If it is synthetic, I'm going to just leave it for 5k miles.