what oil do I use in a b80 trans

[Jake Kuhn 1,556]

Hi guys what weight of oil am I supposed to use in a b80 4 speed? And does a 8 speed use something different? Thanks, Jake

[bowtiebutler956 650]

I use good old 80-90w GL-5 in my B-80 4 speed. I'm pretty sure that is whats called for.

Matt :flags-texas:

[Kelly 1,029]

Both use the same, basicly use what ever Gear oil you want, thinner for winter use might be a good choice.

[wheelhorse656 20]

Both use the same, basicly use what ever Gear oil you want, thinner for winter use might be a good choice.

Well said!

[specialwheelhorse 174]

I use good old 80-90w GL-5 in my B-80 4 speed. I'm pretty sure that is whats called for.

Matt

On the money and if you have any concerns about the yellow metal thing

get gear oil formulated for outboard lower units. JIM in Texas