What does white residue on oil cap mean?
In most cases the white stuff is moisture. The real question is how did moisture causing, white stuff get in your engine. Sometimes you might just end up topping up your engine oil between oil changes. It is during such times that you might notice that your oil cap has a milky, creamy white stuff.
What to do about White Stuff under the oil cap?
When this happens, you are increasing the risk of forming a frothy sludge under the oil cap. If the engine bay requires cleaning, it is best to use low-pressure water spray. It is also important to avoid spraying engine seals such as those found in the valve cover.
What does sludge look like in an oil cap?
A brownish or whitish milky looking sludge inside the oil cap is an indication of water in the engine oil.
What happens when you take off the oil cap?
So, you take the oil cap off of your valve cover to top off your oil. You find a milky creamy white 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?
What to do about Creamy Stuff around oil filler cap?
If it turns from blue to yellow there’s a leak. If you’re looking at cars that could have scuppered engines I’d advise you to bring one along with a compression tester. I think it’s a decent test to walk away from a car, but I wouldn’t use it alone to diagnose HGF.
When this happens, you are increasing the risk of forming a frothy sludge under the oil cap. If the engine bay requires cleaning, it is best to use low-pressure water spray. It is also important to avoid spraying engine seals such as those found in the valve cover.
Why is there Creamy Stuff around the oil filler cap?
It uses no coolant at all, the coolant is clear with no signs of oil deposits, and there is no creamy stuff on the dip stick. The car dose do a fair few short trips from cold. My question is whether the creamy stuff is a result of the short trips and the condensation rising to the top of the engine, or dose this not look good?
So, you take the oil cap off of your valve cover to top off your oil. You find a milky creamy white 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?
Why do I have milky stuff under my oil cap?
If the head gasket gets blown or damaged, engine coolant can leak into the combustion chamber or the passages of the engine oil. It is the latter that causes the milky oil cap. One good way to check for this is by evaluating your engine oil dipstick. Run your engine until it has “warmed up” to its operating temperature.