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Moisture in catch can???

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Old Mar 9, 2010 | 07:29 AM
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Default Moisture in catch can???

So i cleaned my catch can yesterday and seemed to have about 3oz of water in it? I havent really noticed it before. I guess it started when i changed the PCV for a different one. Any clues???
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Old Mar 9, 2010 | 09:15 AM
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Default Hurray

Yes , your oil catch can is working. moisture and oil vapor originate in your crankcase when cold ( ever see water droplets out the tail exhaust tail pipe. Same .
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Old Mar 9, 2010 | 10:08 AM
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It's working and telling you to change your habits. You need to drive the car for longer distances than you apparently are currently doing. Get the oil temperatures up high enough to burn off the condensation. Short stop and go trips do more harm than good. Idling during months of hibernation is not beneficial, either.

If you pull your oil fill cap, chances are you'll see a brown sludge forming under the cap as well.

Do you by any chance have a lower than oem thermostat installed?

You also need to change your oil more frequently when you find condensation in it. That won't lubricate bearings/rings etc.

http://forums.corvetteforum.com/c5-t...iller-cap.html

Last edited by hotwheels57; Mar 9, 2010 at 10:12 AM.
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Old Mar 9, 2010 | 10:15 AM
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Originally Posted by dieseldave56
Yes , your oil catch can is working. moisture and oil vapor originate in your crankcase when cold ( ever see water droplets out the tail exhaust tail pipe. Same .
If you don't see any water in your catch can during cold Winter months, chances are that your catch can is mounted too close to your engine or it's just not doing a good job of trapping moisture.
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Old Mar 9, 2010 | 11:17 AM
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[QUOTE=hotwheels57;1573358296] It's working and telling you to change your habits. You need to drive the car for longer distances than you apparently are currently doing. Get the oil temperatures up high enough to burn off the condensation. Short stop and go trips do more harm than good. Idling during months of hibernation is not beneficial, either.

If you pull your oil fill cap, chances are you'll see a brown sludge forming under the cap as well.

Do you by any chance have a lower than oem thermostat installed?

You also need to change your oil more frequently when you find condensation in it. That won't lubricate bearings/rings etc.

http://forums.corvetteforum.com/c5-t...iller-cap.html[/QUOTE

No sludge. I have some water drolets <10 and a 160* t-stat that typically runs 175*.
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Old Mar 9, 2010 | 11:44 AM
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If you drive your car during the colder winter months, you might consider changing your thermostat back to the oem to help reduce the condensation. It's more due to driving habits of short trips of stop/go though.

If you don't drive the car during the winter, just keep the battery charged (float maintenance charger) and don't even bother starting it and allowing it to idle only.

Wait for those days when you can actually take it out for a good thirty minute plus drive where the oil temperature will burn off the condensation.

Last edited by hotwheels57; Mar 9, 2010 at 11:56 AM.
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