I just bought a boat, motor and trailer today, all in excellent shape. I cannot find the model and serial number on the 15 hp motor. The boat and trailer are 1992 and it looks like the motor is about the same year also, the owner didn't know. I have a 1996 8 hp that is the same as far as controls, choke and so on but the decals on the 15 hp have gray pinstriping in the decal. Also to drain the lower unit it has the standard lower plug but all I can find for the upper is a screw which is in the regular place the upper plug would be, I don't want to mess anything up by removing it when I change the lower unit oil, on my 8 hp the plugs are about the same size. Thanks for any info.