What oil does this drive take? It's in my 1990 Baretta Phaser 230 ob. It has an AQ 231A engine. Best I know is that it just an SP-A outdrive with a 1.61 ratio from what research I've done. How do I tell if it's SP-A1, SP-A2, SP-C, or SP-E?? From Which one it is will determine which oil it takes...