I have been using WalMart Sythetic for years. Never have had an issue. My last Durango (5.9 V8) had 98K miles on it till someone ran a syop sign and ended her life. She burned no oil got 17MPG and tons of power. My current Durango (4.7 V8) has 82K on it and going strong. The 4.7 is a dog compared to the 5.9. I was not going to use it in my 07 JK but my mechanic budy told me that it would not hurt the engine at all. I buy this stuf in the big 5qt jugs and always have a few on the shelf. Change oil every 5000 miles. The only other oil I use is Rotella Synthetic in my Diesel.
2007 Black JKU now known as the Black Mistress. Dynatrack PR 44 front w/RCV axles, 4:88 Gears, Eaton 4P E-Lockers, 2.5 TF Coil Lift with 1" TF spacers, Bilstein 5100 Series Shocks, 33x12.5x15 Duratracs on MB Chaos 5 Wheels, XRC MOD front Bumper, Smitybilt X2O Comp 8000 Winch, LOD Gen 4 Rear Bumper, s-Pod Swith system, Amp Research Retractable Side Steps, Polly performance Suspension Bolt upgrade Superchip Programer and more