I have the new altima hybrid. I love it. I took it for the first oil change at 3750 miles. The dealer told me that you can only use synthetic oil not the regular oil. Does anyone know if this is true? It is about $80 every change which is very expensive. I called a different dealer and they told me the regular oil if fine. One other question is if they used synthetic oil, can I switch back to regular oil? I called Nissan corporate and they never called me back.