I went to a local store today to get an oil filter and oil for the GT. I grabbed a PH3614. I wanted to make sure I remembered the correct number so I asked them to look it up. They looked it up and said the correct filter is PH966B. Now I was confused. I went to the Fram website and looked up the 1.9 GT and it gave PH966B. I called them and they said both are exactly the same except that the PH3614 has a oil check valve in it so if your filter screws on sideways, some oil stays in the filter when you turn the engine off. The PH966B does not. Since the 1.9 goes almost straight up and down it doesn't matter. The PH966B is also a special order filter. Just some info in case you goto a store and they tell you the PH3614 wont work. It always has and still will.