What oil to use in a lower unit?

[RaisedByWolves]

Sure each brand has their own oil, but does using their oil really matter?

Is regular 90wt good enough?

What do you guys use?

 

[nccatfisher]

90 wt will work, true lower unit oil has additives in it where in case water does come in the picture it will still hold up much better. That is somewhat primitive in describing it but true.

 

[GYPSY400]

In my Mercury motors that I bought new I use mercury oils.. in everything else, I use generic 90wt marine oil from canadian tire. ( I know you can't get that in the U.S.) So using any type of Marine gear oil from a reputable brand should be ok..

 

[Pappy]

BRP oil, for example, will continue to supply full protection with up to 25% water in the oil.
Am assuming other major engine manufacturer oils would provide the same level of protection.
For this reason I only run BRP oil.

 

[jethro]

I run the Mystic lower unit oil that you can get from Bass Pro. Seems cheap enough and meets all the specs.

 

[MrGiggles]

I have used Quicksilver, Supertech, and Lucas.

Supertech does not emulsify water very well. When I had a lower unit leak, there was always a little bit of crystal clear water in the bottom. Not so with Quicksilver and Lucas.

Otherwise I haven't noticed much of a difference.