Gear oil Question

S

sk

Seaman Apprentice
Joined
Feb 25, 2010
Messages
39
What gear oil can i use in my 83 Johnson 15hp gear case? Can i use 75-90w synthetic gear oil for cars? or do i have to go buy something special. And how much do i put in? Why can't i put oil in from the top screw?
 
Lrider

Lrider

Chief Petty Officer
Joined
May 19, 2010
Messages
631
Re: Gear oil Question

My experience with synthetic oils in old machines has been not very good, the stuff finds leaks you never knew you had
 
S

sk

Seaman Apprentice
Joined
Feb 25, 2010
Messages
39
Re: Gear oil Question

why does synthetic find leaks?
 
R

rattlin

Cadet
Joined
May 9, 2010
Messages
17
Re: Gear oil Question

sk said:
What gear oil can i use in my 83 Johnson 15hp gear case? Can i use 75-90w synthetic gear oil for cars? or do i have to go buy something special. And how much do i put in?
Click to expand...

Use a marine-grade oil designed for lower units. I don't know the capacity for your motor but it's not so much that you should try to avoid using what the manufacturer recommends. Probably around a quart.

31aePagUA5L._SL500_AA300_.jpg


sk said:
Why can't i put oil in from the top screw?
Click to expand...

Just get something like this. They're not that expensive, usually under $10.

41SSERMJZ3L._SL500_AA300_.jpg


Video showing how to do it:

http://www.youtube.com/watch?v=JgX1Q6bkVoA&NR=1

Note that the motor is tilted for draining and level for filling.
 
E

ezeke

Supreme Mariner
Joined
Sep 19, 2003
Messages
12,532
Re: Gear oil Question

BRP Hi Vis is listed but Marine Synthetic 75-90 gear oil is fine. Gearcase capacity is 9 ounces.

The motor should be in the running position when filled and filled from the bottom (fill) hole until the fluid runs out the top (vent) hole. This eliminates the air pockets and also prevents over-filling which can blow out the seals when the gearcase heats up while running.
 
You must log in or register to reply here.
Top