I changed the oil in the lower unit of my 71 25hp Johnson and noticed the oil looked tannish yellow while draining. See image of what I’m talking about. The other two outboards I also changed looked normal / dark-black colored. This is the first time I changed the lower unit oil on this particular outboard but I know it was done two years ago by a shop. I didn’t see any water drain out and I believe after the initial drain the oil then looked blacker. If this could mean a seal issue, what’s the best way to pressure test? Do they make an attachment? Or do I retro fit some kind of gauge to thread it the fill/drain hole ?
Thanks
Thanks