NHTSA Complaint #10911210 — 2006 HUMMER H3

APPROXIMATELY AT 150,000 MILES, WHILE MAKING A DELIVERY AT THE COUNTY DISPOSAL FACILITY, WHILE MOVING SLOWLY AND PARKING AT EACH STATION, THE ENGINE STARTED CUTTING OFF AND IDLING VERY POORLY, SLIGHTLY KNOCKING. I MADE IT HOME CHECKED THE OIL' WHICH READ LOW, SO I CHANGED THE OIL, OVER 5 QUARTS REMOVED, IT ONLY REQUIRES 6 QTS MAX, AND I REPLACED IT WITH 5 QUARTS OF FULL SYNTHETIC, WITH BG CLEANERS. INITIALLY IT STARTED, IDLED, AND RAN BETTER BUT AFTER 30 MINUTES THE ENGINE KNOCKS RESUMED. THE NEXT DAY I TOOK IT TO MY MECHANIC, HE ASSESSED AND DIAGNOSED IT, CONCLUDING THAT THE ENGINE WAS BAD AND NEEDED REPLACING. I HAD IT THAT CONFIRMED WITH ANOTHER MECHANIC. WENT ON THE HUMMER FORUM BLOGS AND READ MANY SIMILAR COMPLAINTS ABOUT THE ENGINE AND PISTONS WARPING OR DYING BETWEEN 75K-150K. MOST BLAMING GM FOR PUTTING IN DEFECTIVE PISTONS OR AND UNDERSIZED ENGINE 3.5L IN A HEAVY ALL 4 WHEEL DRIVE VEHICLE? NOT SURE WHERE TO GO FROM HERE, A USED OR REFURBISHED ENGINE IS $2500-$3500, WITH INSTALLATION ANOTHER$3000-$3500? I'M NOT SURE IF IT'S WORTH THE STEEP INVESTMENT?