As was said, Premium Plus oil from the dealer is in a black jug, from retail outlets like Bass Pro, it is in the Gray jug. Both are labeled Premium Plus. Premium Plus oil is the preferred oil for the 250 Pro XS. As to the 150 Optimax, Im not sure–Your manual will tell you for sure, but my guess is that it will be the DFI OIL, not Premium Plus. Check your manual to be sure.