What oil to use in a lower unit?

Have a question about your motor? All motor talk and questions go here.
User avatar
RaisedByWolves
Posts: 247
Joined: 07 Oct 2017, 19:26
2
Location: Bucks county PA.

What oil to use in a lower unit?

Post by 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?
Sailbad the Sinner

nccatfisher
Posts: 581
Joined: 04 Feb 2013, 22:11
7

What oil to use in a lower unit?

Post by 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
Posts: 337
Joined: 27 Apr 2012, 21:01
8

What oil to use in a lower unit?

Post by 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..

User avatar
Pappy
Donor
Posts: 2938
Joined: 15 May 2010, 00:38
10
Location: Central Florida

What oil to use in a lower unit?

Post by 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.

User avatar
jethro
Donor
Posts: 1171
Joined: 25 Jul 2013, 16:12
6
Location: Henniker, NH

What oil to use in a lower unit?

Post by jethro »

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

1993 Starcraft SF 14 DLX side console with 25 hp Mercury 2 stroke
2003 Sylvan 2100 Profish walkthrough with 150 Mercury Saltwater and 6hp Mecury 4 stroke kicker

MrGiggles
Posts: 333
Joined: 12 Jul 2017, 21:42
2
Location: Springfield, MO

What oil to use in a lower unit?

Post by 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.