does water get into oil when engine cold ?

[MetalSlug]

My friend ford F150, a month ago, we strip the drain plug, I let him stay over since he bit drinking last night, anyway this morning we try take off the drain plug, big vice grip and it came right off, anyway when I drain the oil I see some small water coming out with the oil, it not mix with the oil or blend with the oil, it like small bubble on the drain pan, just little not much to worried. I just wonder it inside cold engine develope moisture and mix with the oil until drive enought to burn it off.

yes we know we have to drain the oil cold, cause we dont want to warm up the car, then try take off the plug. anyway im on my way to advance to buy new plug.

 

[JavierG]

I thought it was best to drain the oil when the engine was a bit warm? If the vehicle is used only for short trips then it can't get the engine up to temperature and won't be able able to butn off any condensation in there.

 

[ksp7498]

Yes, water does get in the oil. It generally doesn't leak in from the outside (unless you have a blown headgasket or something) but water will condense out of the air in the crankcase from the huge temperature swings it sees. And yes, the water generally evaporates out when you drive long distances where the oil can heat up all the way. If you drive lots of short trips and no long trips the water doesn't have a chance to burn off and will start to accumulate.

However, if you are seeing a significant amount of water in the oil I would start to worry about a blown gasket somewhere because there's only so much that's going to condense. Did the oil look milky (like a chocolate milkshake?)

 

[bigblumer]

Water is also a byproduct of combustion of gasoline (or any other hydrocarbon) 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O, so you'll be making water by just letting the engine run. It gets into the oil due to blowby.

Normally, you'll burn off the water by just driving around with the engine at temp.

The real question, as mentioned above, is how much water are you talking about? A tablespoon or so, or more? Check and monitor the coolant level if you are concerned about it.

 

[MetalSlug]

yes I know it not support to change oil when engine is cold, but we not plan to oil change because it due, but we just try get that drain plug out and if engine is not, we might burn ourself , so we just do it when it cold.

 

[MetalSlug]

Originally Posted By: bigblumer
Water is also a byproduct of combustion of gasoline (or any other hydrocarbon) 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O, so you'll be making water by just letting the engine run. It gets into the oil due to blowby.

Normally, you'll burn off the water by just driving around with the engine at temp.

The real question, as mentioned above, is how much water are you talking about? A tablespoon or so, or more? Check and monitor the coolant level if you are concerned about it.


under 1 table spoon , i just see small water bubble in oil drain pan that all, I never drain oil cold before, so this new to me.

 

[MetalSlug]

Originally Posted By: ksp7498
Yes, water does get in the oil. It generally doesn't leak in from the outside (unless you have a blown headgasket or something) but water will condense out of the air in the crankcase from the huge temperature swings it sees. And yes, the water generally evaporates out when you drive long distances where the oil can heat up all the way. If you drive lots of short trips and no long trips the water doesn't have a chance to burn off and will start to accumulate.

However, if you are seeing a significant amount of water in the oil I would start to worry about a blown gasket somewhere because there's only so much that's going to condense. Did the oil look milky (like a chocolate milkshake?)


no oil is clear, we just change it like a month ago, since when he tight the drain plug back up, it loose, and we dont want wasted the new oil we put in, so I told him just drive, and next oil change we going to take the drain plug off. since he already at my house, and i have free time, we just gonna do it now and dont worried about it any more.

anyway some guy on preview thread say its right, the ford drain plug is made out off soft material and it will strip before the oil pan strip, we just replace it with another plug.

 

[Durango]

It's sounds like overnight condensation that can collect because the oil is hot after you return to home. It's a simular condition on my Dodge Durango where allor of people have noted that a milky substance is collected because of short driving trips and not getting that ol nice and hot.

Once per month I always take my Dodge for a good drive for a good hour and a half to burn off/absorb moisture.

Unless it's a bigger amount of water I wouldn't worry about it.

Durango

 

[MetalSlug]

yes I would not worried, we put new drain plug in and fill with new oil. thanks every one.