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 Outboard Lower Unit Fluid 
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Post Outboard Lower Unit Fluid
Not a mud motor but I figure you guys will know. Recently bought a 2000 135hp optimax. What is the best lower unit fluid to run? Thanks for the help.


Fri May 09, 2014 11:18 am
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Post Re: Outboard Lower Unit Fluid
better check what the manufacture recommends - I run the amsoil in all my outboard L/Us

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Fri May 09, 2014 12:25 pm
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Post Re: Outboard Lower Unit Fluid
Any 80-90 gear oil will work. That's what I have been running in mine since first change in 1990.


Fri May 09, 2014 12:42 pm
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Post Re: Outboard Lower Unit Fluid


Sat May 10, 2014 12:03 am
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Post Re: Outboard Lower Unit Fluid
Amsoil lower unit oil. Best shit made. Slicker n greased owl shit.


Sat May 10, 2014 10:08 am
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Post Re: Outboard Lower Unit Fluid
It's just gear oil. Go to Wal-Mart and get some rotella 80-90 gear oil.

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Sat May 10, 2014 10:52 am
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Post Re: Outboard Lower Unit Fluid
go to walmart in the marine section..they have quicksilver gear oil with the pump made for lower units....i have few laying around my shop...i find that works the best...


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Sat May 10, 2014 10:55 am
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Post Re: Outboard Lower Unit Fluid
Be sure to pump it in from the bottom.


Sat May 10, 2014 9:58 pm
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Post Re: Outboard Lower Unit Fluid
That rotella is probably just as good or better and cheaper. And pump from the bottom till it cones out the top. Like BB said.

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Sun May 11, 2014 7:11 am
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Post Re: Outboard Lower Unit Fluid


Sun May 11, 2014 8:11 am
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Post Re: Outboard Lower Unit Fluid
I figured you would know!! Lol

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Sun May 11, 2014 8:15 am
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Post Re: Outboard Lower Unit Fluid
What you run in the rear end in your truck?

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Sun May 11, 2014 8:15 am
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Post Re: Outboard Lower Unit Fluid
Canola oil!


Sun May 11, 2014 3:27 pm
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