Hi. Im curious on the authenticity of my newly bought engine oil. I get it from a friend of friend. The label call fully synthetic " Synthium 3000 5w-30" with price RM110. First i did not realized the details. But when i check at most Petronas station they only sell " Synthium 3000 5w-40" with price RM210.  Isit possible that ive been conned by fake oil? any advice on how to check the for its authenticity?