Lower unit oil

[jborg]

Hey guys just wondering what oil is my best option to use when changing my lower unit oil for the first time on a newly purchased boat.

Its a 1990 90 Horse Johnson

Thanks

 

[JSMoore]

Re: Lower unit oil

This is a wide open topic that a lot of people have opinions about. I have used Super-Tech 80w 90 marine gear lube from Wal-Mart for years with excellent results. I currently use it in a 1997 Evinrude 90. Super-Tech may, or may not, be the answer for you. I would suggest that you find a good MARINE gear lube, that's readily available where you live and boat, and go with it.
Cheers!
JSMoore

 

[HighTrim]

Re: Lower unit oil

Just ensure it is marine gear oil. Do not forget to change the gaskets!

Lots of youtube videos if you want to watch it done.

 

[Bamaman1]

Re: Lower unit oil

I just purchase a quart of Pennzoil lower unit lube at WalMart for less than $6. Having a pump to install it simplifies the job and makes it cleaner.

I ignored my lower unit on a 1985 Yamaha 115 hp 2 stroke, and water intrusion toasted my bearings/gears. Before you add the new lower unit lube, have your gearbox both pressure and vacuum tested by a qualified marine mechanic. This is a matter of preventive maintenance that needs to be done every couple of years--and on any newly purchased used boat.

I'm guilty of bad maintenance, and I'm having to pay the price--monthly payments on a new Bennington. I figured I got 26 years of great use out of my motor, so I don't feel that bad. Just be careful and take care of your gearbox.