I have had Amsoil (The first in synthetics) since it had 2500 miles 5W-30, I also changed my transmission and transfer case as well as differentials to Amsoil ATF (trans and tranfer case) and SEVERE GEAR 75W-90 full Synthetic on differentials. I have had no problem at all! 
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"2003 Sage green LUX, wrapped around brush guard with off road lamps, roof mounted SMA light bar, AirAid Jr. kit, Delphi Touchscreen Navigation Radio with a 6 CD changer and more! Also a member of the HOPE (Hummer Owners Prepared for Emergencies) pro
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