sentences:  For 1968, the CO-4000 was given an update, with the standard engine becoming the turbocharged IHC DVT573 gasoline V8 with optional diesel Cummins and Detroit Diesel engines.Internally known as the CO/COF-4070A and as COF-4090A (with a raised cab), the new truck was marketed as the Transtar.For 1970, two new models were introduced.