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Yellow residue under my oil cap?
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snapkrackelpop19
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PostPosted: Mon Oct 25, 2010 11:32 pm    Post subject: Yellow residue under my oil cap? Reply with quote

From what I understand it's water mixing with the oil. I believe the only time water could have gotten in was when I changed out the oil cooler and washed some of the oil off the engine, some may have leaked in. But I've done an oil change since then and the residue still comes back. Does this mean I might have a leak or something? Should I do another oil change?
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Inane Cathode
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PostPosted: Mon Oct 25, 2010 11:40 pm    Post subject: Reply with quote

It's just condensation, it'll show up on the oil cap as thats the highest point on the system and it floats up and collects on the inside of the cap. Just drive it for reasonable periods so it gets hot enough to burn off the water in the oil and you'll be fine.
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dizi
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PostPosted: Mon Oct 25, 2010 11:40 pm    Post subject: Reply with quote

how much do you drive the car??? I had a similar post to this about water on the oil cap and the replies i was recieving said that it was normal on an engine that isnt been drivin alot. and it could also be due to weather cuz after i found mine i did an oil change and pulled my filler neck and cleaned it took the car out for a cruise and then i was keepin an eye on that and behold 2 days later it had a little bit of water in there but my garage isnt heated and the weather has cooled right on down
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andk5591 Premium Member
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PostPosted: Tue Oct 26, 2010 5:46 am    Post subject: Reply with quote

Some basic chemistry - water is a by-product of an internal combustion engine. Ever see water drops from a car exhaust or that white smoke until they warm up? Its water. You get it in the crancase and if the car isn't run long enough to cook it out, then it condenses, which is usually onto the coolest spot it can find.....the oil cap. Thats one of the reasons you DON'T start a car for a couple minutes every week during off season - you load up the case with water.
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snapkrackelpop19
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PostPosted: Tue Oct 26, 2010 8:43 am    Post subject: Reply with quote

Ohh okay, that makes sense. It's mostly an offroader but sometimes I'll take it for short drives around town, which is probably how the water got there. Thanks Smile
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69 Jim
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PostPosted: Tue Oct 26, 2010 8:49 am    Post subject: Reply with quote

Is the thermostat and flaps installed?
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gt1953
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PostPosted: Tue Oct 26, 2010 5:11 pm    Post subject: Reply with quote

Drive that car for about 40 miles at free way speed and it will dissipate it.
This time of year we will see many post with the same issue, white goo under oil filler.
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lupin..the..3rd
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PostPosted: Tue Oct 26, 2010 5:17 pm    Post subject: Reply with quote

69 Jim wrote:
Is the thermostat and flaps installed?

x2, this is a great question. Without the thermostat and flaps in place, the engine simply will never reach operating temperature in the winter time, no matter how long you drive it.
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