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Gear lube in engine oil #4517873
09/16/17 12:43 PM
09/16/17 12:43 PM
Joined: Sep 2017
Posts: 2
Ontario
Ccruji Offline OP
Ccruji  Offline OP
Joined: Sep 2017
Posts: 2
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

Last edited by Ccruji; 09/16/17 12:44 PM.
Re: Gear lube in engine oil [Re: Ccruji] #4517879
09/16/17 12:53 PM
09/16/17 12:53 PM
Joined: Jun 2006
Posts: 370
Texas
Neely97 Offline
Neely97  Offline
Joined: Jun 2006
Posts: 370
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 .


6.7 cummins, Toyota 4 runner
FUMOTO
Re: Gear lube in engine oil [Re: Ccruji] #4517903
09/16/17 01:42 PM
09/16/17 01:42 PM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
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 ?


Multiple Diesel and Gasoline vehicles
Re: Gear lube in engine oil [Re: Ccruji] #4517910
09/16/17 01:53 PM
09/16/17 01:53 PM
Joined: Sep 2017
Posts: 2
Ontario
Ccruji Offline OP
Ccruji  Offline OP
Joined: Sep 2017
Posts: 2
Ontario
It was 25w40. Thanks

Re: Gear lube in engine oil [Re: Ccruji] #4517920
09/16/17 02:07 PM
09/16/17 02:07 PM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
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.

Last edited by ArcticDriver; 09/16/17 02:22 PM.

Multiple Diesel and Gasoline vehicles
Re: Gear lube in engine oil [Re: Ccruji] #4517924
09/16/17 02:11 PM
09/16/17 02:11 PM
Joined: Jun 2003
Posts: 33,575
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,575
ME
Gear lube has sulfur in it which will attack your engine internals. How much, IDK, but it's not good.

Re: Gear lube in engine oil [Re: Ccruji] #4517948
09/16/17 02:43 PM
09/16/17 02:43 PM
Joined: Jun 2002
Posts: 19,525
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,525
Iowegia - USA
I would change it before winter storage.


Scars remind us of where we have been, but do not have to dictate where we are going.
Re: Gear lube in engine oil [Re: MolaKule] #4517964
09/16/17 03:24 PM
09/16/17 03:24 PM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
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


Multiple Diesel and Gasoline vehicles
Re: Gear lube in engine oil [Re: Ccruji] #4518118
09/16/17 06:54 PM
09/16/17 06:54 PM
Joined: Dec 2016
Posts: 7,174
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,174
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.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Gear lube in engine oil [Re: ArcticDriver] #4518119
09/16/17 06:54 PM
09/16/17 06:54 PM
Joined: Dec 2016
Posts: 7,174
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,174
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."
Re: Gear lube in engine oil [Re: Linctex] #4518181
09/16/17 08:06 PM
09/16/17 08:06 PM
Joined: Jan 2017
Posts: 1,139
USA
ArcticDriver Offline
ArcticDriver  Offline
Joined: Jan 2017
Posts: 1,139
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


Multiple Diesel and Gasoline vehicles
Re: Gear lube in engine oil [Re: Ccruji] #4520371
09/19/17 01:36 PM
09/19/17 01:36 PM
Joined: Sep 2015
Posts: 6,080
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,080
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


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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