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 Oil looks off 
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Joined: Wed Mar 21, 2018 2:51 pm
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Location: Michigan
Post Oil looks off
20181202_100743.jpg
This oil came out of a 60 horse Bigfoot Mercury 4 stroke motor. This is what it looked like after settling overnight. I was wondering why it might look like this. I put some in a glass jar to settle overnight also. I did not see any water separate after sitting overnight. The motor is only 3 years old

Any thoughts?


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Sun Dec 02, 2018 9:17 am
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Joined: Tue Jan 13, 2009 7:19 pm
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Location: Trinity Bay - Texas
Post Re: Oil looks off
H2O - gasket time....

Water emulsified in oil...

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Sun Dec 02, 2018 10:20 am
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Location: Michigan
Post Re: Oil looks off
Ya. The more it settles the more you can see the water on top. The oil I put in the jar has a distinct line forming at the top now.

I was going to put it in storage today, but decided to drop it of at the shop.


Sun Dec 02, 2018 5:45 pm
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Post Re: Oil looks off
Good that you caught it - likely just a head gasket...

Compression test should show which cylinder is the culprit...

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Sun Dec 02, 2018 6:14 pm
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Location: Michigan
Post Re: Oil looks off
Turns out it was a bad thermostat. Engine was running cold allowing for condensation. The EFI was feeding it extra fuel as well. You could smell the gas in the oil.


Sun Dec 23, 2018 1:14 pm
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