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#12647005 - 02/25/18 10:16 PM Lower unit oil??
Crankenstein7 Offline
Angler

Registered: 06/10/12
Posts: 300
Loc: North of Decatur Tx
I picked up some Lucus heavy duty high performance SAE 80W-90 gear oil the other day.. can I use this to change my lower unit oil , Mercury Optimax, 225 ,, dealer has always done this, but Iím wanting to myself, any information would be appreciated..
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Big Sack..!!!
PB 12.24 Ray Roberts 2014

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#12647016 - 02/25/18 10:28 PM Re: Lower unit oil?? [Re: Crankenstein7]
H2ODawg67 Online   content
Angler

Registered: 04/07/17
Posts: 316
Loc: Kansas
I don't believe so. I don't recall the proper weight, but it's not as thick as the 80/90 wt. differential oil. Also the plug seals are like $2 a piece but I would replace them. Lower units are not cheap. You know what they say "water and oil doesn't mix".
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Formerly H2ODawg

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#12647069 - 02/26/18 12:00 AM Re: Lower unit oil?? [Re: Crankenstein7]
Crankenstein7 Offline
Angler

Registered: 06/10/12
Posts: 300
Loc: North of Decatur Tx
Why would u replace the seal plugs?? They just screw in and out?
_________________________
Big Sack..!!!
PB 12.24 Ray Roberts 2014

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#12647085 - 02/26/18 02:15 AM Re: Lower unit oil?? [Re: Crankenstein7]
Bobby Milam Offline
TFF Team Angler

Registered: 07/13/14
Posts: 3506
Loc: Arlington
The seals on the plug (o-ring).

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#12647118 - 02/26/18 05:47 AM Re: Lower unit oil?? [Re: Crankenstein7]
Crankenstein7 Offline
Angler

Registered: 06/10/12
Posts: 300
Loc: North of Decatur Tx
🤔 ok I gotcha ...
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Big Sack..!!!
PB 12.24 Ray Roberts 2014

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#12647678 - 02/26/18 11:56 AM Re: Lower unit oil?? [Re: Crankenstein7]
jafish Offline
Angler

Registered: 10/02/09
Posts: 377
Loc: lubbock,tx
Been running 80 90 on my 225 all along and itís a 1994 and still running. I have resealed the lower unit 3 are 4 times over the years. Iím not talking about the little plug o-rings. You need to teach yourself and your kids how to replace the water pump. Iím old now and the kids do all of that now. I check for water often and am always shocked when I find water in the lower unit ( but dam glad I checked to see) water is a killer. The first you find water you will check more often after that. Seals are cheap.
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TAKE A PHOTO HOME NOT THE FISH. CATCH AND RELEASE
Set the hook first and ask questions later.

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#12647706 - 02/26/18 12:07 PM Re: Lower unit oil?? [Re: Crankenstein7]
jafish Offline
Angler

Registered: 10/02/09
Posts: 377
Loc: lubbock,tx
I guess you know to pull the bottom plug real quick and then replace it to check for water in the grease. If you donít that is how itís done. That water is the death of your lower unit. If you pull it enough times you will find water. That fishing line behind your prop will get under the seal lip and allow water to enter. Everyone may already know this but if it saves one lower unit so be it.
_________________________
TAKE A PHOTO HOME NOT THE FISH. CATCH AND RELEASE
Set the hook first and ask questions later.

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#12647988 - 02/26/18 02:31 PM Re: Lower unit oil?? [Re: Crankenstein7]
Allison1 Online   sleepy
TFF Guru

Registered: 12/14/03
Posts: 18554
Loc: Grand Prairie, Tx


Mercury and Quicksilver are the same thing. You don't want to use a regular oil in a lower unit. This stuff and any good marine lower unit gear lube will protect your lower unit if there is any water intrusion. Not perfect if you leave water in there for a long time but without this special protection your lower unit innards will start corroding as soon as water gets inside.

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#12649054 - 02/27/18 08:03 AM Re: Lower unit oil?? [Re: Allison1]
Bossbowman Online   content
TFF Team Angler

Registered: 03/14/05
Posts: 3234
Loc: Hill county
Originally Posted By: Allison1


Mercury and Quicksilver are the same thing. You don't want to use a regular oil in a lower unit. This stuff and any good marine lower unit gear lube will protect your lower unit if there is any water intrusion. Not perfect if you leave water in there for a long time but without this special protection your lower unit innards will start corroding as soon as water gets inside.

Yes use the above, I think 80W-90 is more preferred for smaller outboards under 100 HP

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#12649594 - 02/27/18 01:02 PM Re: Lower unit oil?? [Re: Crankenstein7]
onfork Offline
Outdoorsman

Registered: 07/19/12
Posts: 95
Originally Posted By: Crankenstein7
I picked up some Lucus heavy duty high performance SAE 80W-90 gear oil the other day.. can I use this to change my lower unit oil , Mercury Optimax, 225 ,, dealer has always done this, but Iím wanting to myself, any information would be appreciated..
lucas makes great products,but they have a full synthetic lower unit oil for marine lower units,it has a additive package more suited for outboards,the oil you have is a great one but it is not for marine use,

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#12650653 - 02/27/18 09:36 PM Re: Lower unit oil?? [Re: Crankenstein7]
Curtbass Offline
Extreme Angler

Registered: 04/17/15
Posts: 1601
I use Lucas full synthetic M80 Marine Lower Unit oil & have for years. Yes, you DO need to get the M80 Marine Oil for lower unots, not the automotive/truck 80-90 weight.
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92' ChampioN 201DCR Elite
13' Yamaha250SHO
HB's
Minnkota

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#12650658 - 02/27/18 09:41 PM Re: Lower unit oil?? [Re: Crankenstein7]
Curtbass Offline
Extreme Angler

Registered: 04/17/15
Posts: 1601
Lucas M80 marine oil has additives to prevent foaming & regular Lucas 80-90 gear lube doesnt. Air bubbles in lower unit gear oil allow wear/heat build because gears arent 100%fully covered in oil.
_________________________
92' ChampioN 201DCR Elite
13' Yamaha250SHO
HB's
Minnkota

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