[Mohamed Sharaf]

I just want to ask if its worth the money to have full synthetic oil such as mobil 1 on a V6, I haven't changed my oil yet, and my camaro's agency is saying that only delphi is GM certified, so by not filling my Camaro with delphi I might void the warranty!! So I just want to know if having mobil 1 worth arguing my agency abt it? FYI, I must change my Oil every 6213 miles at the agency not to void the warranty. (It just feels right to me to change the oil after 1800 miles)