what weight gear oil should i use in a 77 mercury lower unit
J johnniemooner Recruit Joined May 24, 2009 Messages 4 Jun 13, 2009 #1 what weight gear oil should i use in a 77 mercury lower unit
C Chris1956 Supreme Mariner Joined Mar 25, 2004 Messages 28,073 Jun 14, 2009 #2 Re: lower unit helppppppppppp Use some standard Marine gear oil. I think it is 85W or 90W
