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Jan 23rd, 2013
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Lower unit oil?? #12647005
02/26/18 04:16 AM
02/26/18 04:16 AM
Joined: Jun 2012
Posts: 300
North of Decatur Tx
C
Crankenstein7 Offline OP
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Crankenstein7  Offline OP
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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..


Big Sack..!!!
PB 12.24 Ray Roberts 2014
Re: Lower unit oil?? [Re: Crankenstein7] #12647016
02/26/18 04:28 AM
02/26/18 04:28 AM
Joined: Apr 2017
Posts: 358
Kansas
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H2ODawg67 Offline
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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".


Formerly H2ODawg
Re: Lower unit oil?? [Re: Crankenstein7] #12647069
02/26/18 06:00 AM
02/26/18 06:00 AM
Joined: Jun 2012
Posts: 300
North of Decatur Tx
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Crankenstein7 Offline OP
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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
Re: Lower unit oil?? [Re: Crankenstein7] #12647085
02/26/18 08:15 AM
02/26/18 08:15 AM
Joined: Jul 2014
Posts: 3,619
Arlington
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Bobby Milam Offline
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The seals on the plug (o-ring).

Re: Lower unit oil?? [Re: Crankenstein7] #12647118
02/26/18 11:47 AM
02/26/18 11:47 AM
Joined: Jun 2012
Posts: 300
North of Decatur Tx
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Crankenstein7 Offline OP
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🤔 ok I gotcha ...


Big Sack..!!!
PB 12.24 Ray Roberts 2014
Re: Lower unit oil?? [Re: Crankenstein7] #12647678
02/26/18 05:56 PM
02/26/18 05:56 PM
Joined: Oct 2009
Posts: 378
lubbock,tx
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jafish Offline
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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.


TAKE A PHOTO HOME NOT THE FISH. CATCH AND RELEASE
Set the hook first and ask questions later.
Re: Lower unit oil?? [Re: Crankenstein7] #12647706
02/26/18 06:07 PM
02/26/18 06:07 PM
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Posts: 378
lubbock,tx
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jafish Offline
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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.
Re: Lower unit oil?? [Re: Crankenstein7] #12647988
02/26/18 08:31 PM
02/26/18 08:31 PM
Joined: Dec 2003
Posts: 18,895
Grand Prairie, Tx
Allison1 Online sleepy
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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.

Re: Lower unit oil?? [Re: Allison1] #12649054
02/27/18 02:03 PM
02/27/18 02:03 PM
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Posts: 3,602
Hill county
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Legend LE-195 Offline
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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

Re: Lower unit oil?? [Re: Crankenstein7] #12649594
02/27/18 07:02 PM
02/27/18 07:02 PM
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Posts: 100
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onfork Offline
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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,

Re: Lower unit oil?? [Re: Crankenstein7] #12650653
02/28/18 03:36 AM
02/28/18 03:36 AM
Joined: Apr 2015
Posts: 1,663
Grand Prairie Tx
Curtbass Offline
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Grand Prairie Tx
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.


92' ChampioN 201DCR Elite
13' Yamaha250SHO
Re: Lower unit oil?? [Re: Crankenstein7] #12650658
02/28/18 03:41 AM
02/28/18 03:41 AM
Joined: Apr 2015
Posts: 1,663
Grand Prairie Tx
Curtbass Offline
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Grand Prairie Tx
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
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