I got an oil change 3 months back and the dealer put next oil change interval sticker for 5k miles. I called them today and they said that it probably was put by mistake. I am concerned that it is possible that they put the wrong engine oil in my Jeep ? Thinking back my Jeep has ran noticeably rougher after my last oil change 5k miles back. Any suggestions how to check if the dealer actually put the right oil in ?