Y 20 DTH OHC 16V Engine
The supercharged OHC 16V engine is used in the Astra–G. The engine identification is "Y 20 DTH". The familiar X 20 DTH engine from the Vectra–B and Omega–B is used as the basis for the Y 20 DTH engine. The engine, engine attaching parts and their function are very similar. The only modifications which have been made are vehicle–specific.