I went to two different places today to try and get an oil change and both of them said that I have to use either full synthetic oil or synthetic blend for my car. I didn't believe them so then I went home and looked at the manual and it says that "genuine nissan oil 0W-20 SN is recommended" but if that is unavailable to "use an equivalent motor oil that matches the above grade and viscosity". I mean I am not a mechanic but I find that hard to believe. I read online that the reason nissan wants you to use that is to improve fuel consumption, but that it does not make a big difference and that you can use 5W30. One of the guys where I asked to change my oil said if its 5W30 then it has to be full synthetic. I don't know it just seems like a scam to me so they can get us to keep going to the dealership for oil changes. I HATE going to the dealership not because of the price but because I have to wait like weeks before I can get an appointment with them and then when I actually show up for the appointment it takes them like 2 hours to change the damn oil. I remember reading online posts like years ago and they said that there is nothing wrong with using conventional oil and that it can even be better for new cars. What are your thoughts?