Deferd my term from spring 2016 to fall 2016 and obtained i20 with same sevis number .can i travel with same visa

My visa was issued on december 16 2016 valid for 5 years ,and i am going to same university for same course .as i have come across forums stating five months rule that if i did not enter US from the date of visa issue then i have to go for new visa stamping,so i want a precise answer to avoid any problem during my travel and would like to add that I contacted my university upon this issue and I was informed by international student advisor that I can use same Visa but I am really confused .so please help me out with this