My son in law has a 2005 Infiniti M45. It's a fantastic car (wish I could afford one...), with every option in the book. We were talking about oil changes the other day; I use nothing but Mobil 1 in all of my vehicles. He agreed, but he said his dealer told him explicitly that he is NOT supposed to use synthetic in that Infiniti. Note, he didn't say "there's no difference," or "regular oil is fine," etc. He said DO NOT use it. That doesn't make sense to me. Does anybody have any idea where this guy was coming from, or was he just plain wrong?
Ron M.