Hi Guys, new guy here with a question. Just drained my gear oil in a Yamaha f200i4. Using Amsoil marine gear lube since new 200 hours ago. On this 100 hour oil change the amsoil that goes in a light honey colour drained black. No sign of water intrusion just very black gear lube. Checked the oil drained for metal pieces with a magnet but only showed some tiny fragments ( expected). Not much on the drain plug magnet. Can any one explain the change from honey coloured to black in a 100 hr. oil change. Look forward to hearing from you. With thanks, trapper2