In my honest opinion...the I-6 that Chevrolet produced for decades is one of the best motors ever produced. They'd run on 2 cylinders...2 quarts of oil in the crankcase...half a gallon of water in the radiator!!!!! Take a beating, literally, and just keep coming back for more. The small block V-8's get all the glory. The I-6 is as good or better. No reason to believe the I-5 now being made would not be just as good.