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#4517873 - 09/16/17 01:43 PM Gear lube in engine oil
Ccruji Offline


Registered: 09/15/17
Posts: 2
Loc: Ontario
I have a 75hp Mercury 4 stoke. I changed the oil and filter and added 5 litres of new oil. I needed a little more to top it off but unfortunately I grabbed my gear lube. I quickly caught myself but probably added 50ml of gear oil to the engine oil. Question, am I ok to run the engine with this little bit of gear oil or do I need to drain and add new oil? Thanks


Edited by Ccruji (09/16/17 01:44 PM)

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#4517879 - 09/16/17 01:53 PM Re: Gear lube in engine oil [Re: Ccruji]
Neely97 Offline


Registered: 06/13/06
Posts: 370
Loc: Texas
That is under 2 ounces , that isn't much.

My only experience with this was years ago at a car dealer, the bulk oil tank for 30 w got filled with 90 gear.

Several vehicles came back with damaged engines .
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#4517903 - 09/16/17 02:42 PM Re: Gear lube in engine oil [Re: Ccruji]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
5 Liters = 5,000 mL oil and 50 mL gear oil.

So you added slightly less than 1% gear oil (please check my math).

I would not worry about it in my boat and I have Mercs.

10w30 or 25w40 ?
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#4517910 - 09/16/17 02:53 PM Re: Gear lube in engine oil [Re: Ccruji]
Ccruji Offline


Registered: 09/15/17
Posts: 2
Loc: Ontario
It was 25w40. Thanks

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#4517920 - 09/16/17 03:07 PM Re: Gear lube in engine oil [Re: Ccruji]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
Follow-up.

Now you have me wondering what the effect will actually be. grin

Is it the Mercury High Performance Gear Lube SAE-90 or the Premium 80W90 ? I am assuming you use premium for outboards?

For some reason these two are not be mixed:
https://www.mercurymarine.com/en/us/part...ants/gear-lube/

I don't think 1% is enough to matter but lets see what a tribologist says.

Edit:

I am running by West Marine shortly and I will ask them why the two lubes can't be mixed. That might provide some insight as to they will countersct with motor oil.


Edited by ArcticDriver (09/16/17 03:22 PM)
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#4517924 - 09/16/17 03:11 PM Re: Gear lube in engine oil [Re: Ccruji]
eljefino Offline


Registered: 06/15/03
Posts: 32775
Loc: ME
Gear lube has sulfur in it which will attack your engine internals. How much, IDK, but it's not good.

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#4517948 - 09/16/17 03:43 PM Re: Gear lube in engine oil [Re: Ccruji]
MolaKule Offline


Registered: 06/05/02
Posts: 19135
Loc: Iowegia - USA
I would change it before winter storage.

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#4517964 - 09/16/17 04:24 PM Re: Gear lube in engine oil [Re: MolaKule]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
Originally Posted By: MolaKule
I would change it before winter storage.


Good to know but the OP lives in FL, his winter may not be the winter you think. grin
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#4518118 - 09/16/17 07:54 PM Re: Gear lube in engine oil [Re: Ccruji]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
I don't think it'll hurt anything. I have known many people who have added an entire quart to their car engines in the past.

Maybe run the OCI a little shorter than usual.
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(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4518119 - 09/16/17 07:54 PM Re: Gear lube in engine oil [Re: ArcticDriver]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: ArcticDriver

Good to know but the OP lives in FL, his winter may not be the winter you think. grin


Ontario is in Canada.
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4518181 - 09/16/17 09:06 PM Re: Gear lube in engine oil [Re: Linctex]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
Originally Posted By: Linctex
Originally Posted By: ArcticDriver

Good to know but the OP lives in FL, his winter may not be the winter you think. grin


Ontario is in Canada.


What the heck, I could have sworn it said Orlando.

Guess its time to get a stronger eyeglass prescription. grin
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#4520371 - 09/19/17 02:36 PM Re: Gear lube in engine oil [Re: Ccruji]
BrocLuno Offline


Registered: 09/06/15
Posts: 5621
Loc: Kalifornia Kollective
Gear lube and yellow metals may not be compatible (depends on the lube)... 25W-40 is stout oil and the add pak will likely absorb the gear oil OK. I would not be concerned as this is tiny dose.

But I'd try real hard not to do it again laugh
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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