White stuff under my oil cap.
You take the cap off of your valve cover to top off your oil or fill the crankcase. You find a white milky creamy stuff coating the underside of the oil cap and down into the filler hole.
So what is this white stuff and what is it doing in my oil system?
In most cases the white sludge is moisture.
White Stuff-The real question is how did moisture get in your engine. Determining how the moisture got into the engine will tell you whether this is nothing to worry about or if it’s something more serious. Causes can range from condensation from weather changes to a blown head gasket.
Condensation in the Oil System (white stuff)
This is more common than you might think. A weather change from warm, moist weather to cold weather or repeated frost (condensation) on the vehicle and frequent high dew points can create moisture to form in the crankcase.
This can appear as condensation in the oil system and under the valve covers. Most of the time vehicles are driven long and far enough so that this condensation is burned off thanks to the heat of the engine.
A vehicle that is not driven very far does not reach full running temperature to purge out the moisture. Vehicles that are not driven frequently and sit outside can also acquire moisture in the oil system.
When these vehicles are driven, the engine generates some heat during the short drive, then cools. The trapped moisture condensates on the coolest part of the engine, the valve cover and oil cap. Repeated short trips will leave behind more and more moisture on these cooler parts.
You open the cap and discover this milky white buildup of creamy mocha colored slim.
Is this condensation harmful? (white stuff)
Other causes of moisture in the engine (white stuff)
Dirt on the outside of an engine does far less harm than moisture in the engine.
PLEASE SHARE ENGINE PORTAL NEWS