Chocolate milk oil in my X370 - any way to prevent it?
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    Chocolate milk oil in my X370 - any way to prevent it?

    Pulled my mower out the other day to get it ready for spring - and noticed the oil had that chocolate milk look to it.

    I know WHAT it means, and understand to a degree the why - but how do I prevent it going forward?

    Machine has only 12 hours on it - I don’t have a huge yard, so I get that it doesn’t get a good workout to potentially burn off all the moisture. But why am I getting it in the first place - air cooled engine and garaged in a climate where humidity isn’t a big deal.

    Obviously, can just change the oil more frequently than once a year. Still just doesn’t seem right that so much moisture should be building up in the oil does it? Guess I’ll try running it at higher revs and drain/see what it looks like after 5 cuts to see if that helps. Any other thoughts..

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    Quote Originally Posted by toymaker View Post
    Pulled my mower out the other day to get it ready for spring - and noticed the oil had that chocolate milk look to it.

    I know WHAT it means, and understand to a degree the why - but how do I prevent it going forward?

    Machine has only 12 hours on it - I donít have a huge yard, so I get that it doesnít get a good workout to potentially burn off all the moisture. But why am I getting it in the first place - air cooled engine and garaged in a climate where humidity isnít a big deal.

    Obviously, can just change the oil more frequently than once a year. Still just doesnít seem right that so much moisture should be building up in the oil does it? Guess Iíll try running it at higher revs and drain/see what it looks like after 5 cuts to see if that helps. Any other thoughts..
    Any time you have a big air temperature swing you have the potential for moisture build up. I have had my shop reach the dew point on the inside during what I consider a low humidity part of the year. As far as your tractor goes maybe operate a few times during the winter to where it reaches operating temperature. Maybe that will keep the moisture from building up.
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    With what you describe I would just change the oil twice a year - once in the spring and once in the fall. I mean how much is a couple quarts of oil?
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    Chocolate milk oil in my X370 - any way to prevent it?

    After running it pop the dipstick open. Just watch the steam flow out.

    The other thing you could do if youíre really concerned about it is make a simple desiccant air pump with a fish tank pump and some silica canisters.


    Something like this.

    Engine Dehydrator - YouTube

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    Last edited by J3 Driver; 04-12-2019 at 08:47 AM.
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    You could change the oil more frequently. However, if it were me, I would be interested, like realllllllllly interested, to find out what is causing the milky oil. Usually it is water as mentioned above. But what is the source of the water?
    -Condensation?
    -Water ingestion through airbox (ie: snow)?
    -Head gasket leak?

    At this point I would change the oil, run it for a couple hours, then change the oil again to make sure I got all the crappy oil out. Then I would check the oil very frequently to try to figure out what is causing the problem.

    I would also contact my dealer. Assuming it is still under warranty, by contacting them they will have it on record if it comes down to needing repairs under warranty.
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    When you say you will try higher revs, I take it you do not mow at full throttle? How long does it take you to mow?

    I like to change oil at the end of mowing season (I only mow, no snow work). My theory is it is better to sit all winter with clean oil in it. Maybe you should change oil in the spring so you start with clean oil and not worry about it collecting moisture all winter, since it will be changed in the spring. Or do you use it in the winter too?
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    Interesting thread. I've never encountered milky oil in an air cooled engine, and in Georgia here it gets very humid with a lot of temp swings.
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    Quote Originally Posted by jimmylh View Post
    Interesting thread. I've never encountered milky oil in an air cooled engine, and in Georgia here it gets very humid with a lot of temp swings.
    Quaker State oil, a long time ago loved moisture. My dad's Dart had milk in it one time. All he did to get rid of the problem was change brands of oil. That is what I would suggest. But keep a sample, in case of engine issues later on. What oil did you have in it?

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    Yeah, this isn't just condensation.

    Either water is somehow infiltrating through some unknown point, or my best guess, you have a head gasket leak. You'll kill your motor in short order like that. Drop it off at the dealer. A dead giveaway is your coolant level isn't at the max level on the bottle (at appropriate temperature). To give you an idea, I changed the oil in a car that sat for well over six months, this was during the very moist spring season. I changed the oil with only 300 miles on it (it was conventional oil, and goes acidic). The oil looked like it came right out of the bottle, I was actually a little sad to have cracked open that drain bolt.
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    Quote Originally Posted by firemachine69 View Post
    Yeah, this isn't just condensation.

    Either water is somehow infiltrating through some unknown point, or my best guess, you have a head gasket leak. You'll kill your motor in short order like that. Drop it off at the dealer. A dead giveaway is your coolant level isn't at the max level on the bottle (at appropriate temperature). To give you an idea, I changed the oil in a car that sat for well over six months, this was during the very moist spring season. I changed the oil with only 300 miles on it (it was conventional oil, and goes acidic). The oil looked like it came right out of the bottle, I was actually a little sad to have cracked open that drain bolt.
    The OP's X370 has an air-cooled Kawasaki engine.
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