Hoping for some help here and couldn't find what I needed via search... I recently took my '05 Jeep Grand Cherokee 4.7L to national tire store for an oil change. I bought a package of 5 oil changes for $70 which is far cheaper than doing it myself, so I figured I'd give it a shot.
The shop told me that my Jeep came with synthetic blend from the factory and that they would not put anything less in it. I bought the Jeep from a family member @ 30k miles and have put conventional the whole time. I pulled the book out and it only recommends 5w-30 and does not specify conventional, synthetic, or synthetic blend.
The shop's argument is that it came from the factory with the blend. Does anyone have any Jeep/Chrysler documentation that shows what oil my Jeep came with from the factory?
Thanks for the help!