20% gear oil in a five quart motor?

Bill in Utah

Staff member
Messages
12,849
Location
UT
 Originally Posted By: Johnny
I would drain it as soon as possible. The EP additive (sulphur content) of the gear oil is not good for the internal combustion engine.
Agree. A oil change is your best friend right now.
 
Messages
1,574
Location
Ca, US
 Originally Posted By: montero91
My daughter grabbed the wrong jug to top off the oil and may have added a 1/2 to a full quartof 80w90, what could happen here? thank-you.
I guess she didn't read the bottle before pouring it into the engine. She must have grabbed the bottle with the easy pour spout. Excellent excuse to change the motor oil and filter. Gear oils have different friction modifiers than motor oil and have a low TBN.
 
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Messages
25,044
Location
ON, Canada eh?
Agreed, get it out of there ASAP. \:\! Then I would do a shorter run with some cheap regular oil and then change out and go back to what you are used to.
 
Messages
651
Location
Iowa
 Originally Posted By: montero91
My daughter grabbed the wrong jug to top off the oil and may have added a 1/2 to a full quartof 80w90, what could happen here? thank-you.
When in doubt, change it out.
 
Messages
1,574
Location
Ca, US
 Originally Posted By: Junior
 Originally Posted By: montero91
My daughter grabbed the wrong jug to top off the oil and may have added a 1/2 to a full quartof 80w90, what could happen here? thank-you.
When in doubt, change it out.
Just change it out... you sleep better at night. Rather than worrying if its 1 qt of MTF or 1/2 qt of ATF or some other fluids that don't belong in the engine. Today is Saturday you know what you have to do.
 
Messages
25,044
Location
ON, Canada eh?
 Originally Posted By: Drew99GT
If you wash the motor out with brake clean there shouldn't be any harm.
Be nice! Just change the oil ASAP and don't worry...
 
Messages
3,423
Location
FL
It seems like nobody is sure what exactly is in there. Why not change it just to be safe? None of what you have said belongs in there.
 
Messages
962
Location
San Antonio, Texas
Someone said it above. Change the oil & filter with some cheapo stuff. Go drive around a while and then change it again with the normal oil & filter. Since what's in there seems to still be a mystery I wouldn't drive it all all until you've done this. Better safe than sorry.
 
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