Does anyone know why a 5.0 lower end would be using gear lube? I have Checked for leaks and have found none! This power plant is pushing a 210 BR Crownline, and it seems to use more when, Skiing. boarding etc. My 19ft with a 6 cyl. never used gear lube like this. I am filling the reserve about every 2 weeks.. in about 10 hours of run time. Power seems to be normal, as well as pressure,s and temp.