Super weird noises

[muffin401]

When the van warms up it makes this really odd noise, its hard to explain the noise, kinda like a gurgle, boiling,bubbling kind of sound. When you check the oil after this noise starts, the dipstick comes out with bubbles on it?!?! Any one know what this might be?

[firechicken1986]

These bubbles you are talking about in the oil is it a milky color

[muffin401]

No its dirty oil... the oil is going to be changed... would i be able to tell when the oil is dirty?

[firechicken1986]

if it is real dark in color yes it's dirty alright

[larryhe]

A head gasket leak can put combustion gases into the cooling system. If it is a small leak it will cause the cooling system to bubble in the overflow tank. I heard bubbling after I killed the engine. Everyone told me this was not possible because the coolant would become to hot causing the engine to overheat. I could drive for hours and the temp never got above normal.