Water in the oil! lack of power and foam on the dip stick or white smoke: Head gasket?
No loss of power lots of foam, gets hot rainbow on the water surface: crack in the engine or head? ouch!
Water is getting into the engine. Change the head gasket before it blows.
You probably have a cracked engine block and engine coolant is mixing with engine oil.
It can cause your oil cap to blow right off, foam around the oil cap is more likely to be water or coolant. Get it checked right away because it can damage your engine. It's usually a sign of a bad head gasket, it lets water into the oil and oil into the water. Check your radiator to see if there is oil in the water and if the water is low.
Styrofoam? Yes, but only if it contains ethyl esters which decreases the absorption. A lower quality fish oil
Air bubbles in radiator with engine running, sweet smell coming from exhaust pipe, overheating, coolant in oil, white foam on underside of oil cap, and low compression on one or more cylinders.
Foam in the oil pour spout, on the inside of the cap, or on the dipstick or dipstick tube is an indication that moisture has entered into the oil. This could be nothing more then condensation from short driving trips, or as serious as a blowed head gasket or cracked head/block. Drain your oil and take a good look at it. does it appear to be foamy? Brownish in color? If in doubt, have a qualified mechanic look at it. It could be serious.
Possible blown head gasket. If the exhaust smells & taste sweet, bubbles in radiator, loss of coolant with no apparent leak, coolant in oil & foam on underside of oil cap, you have a blown head gasket.
under the rear fender on the left side.You must first remove seat so that you can access the cap for the oil tank.Do not remove foam baffle from oil tank.
Anytime coolant is entering the combustion chamber it is an indication that you have either a blown head gasket or a cracked head. Symptoms are white smoke from the exhaust, loosing coolant with no apparent leak, oil level increasing, & white foam on the underside of the oil cap. STOP driving the vehicle immediately. Serious engine damage will occur if you do not have this repaired immediately.
You have coolant getting mixed in with the oil. The head gasket and intake manifold gasket would be your most likely culprits.
The oil capacity is probably around four to six quarts. If there is white residue inside the oil cap, then that means you either have a blown head gasket, or there is water getting into your engine block.
The white foam is a mixture of a liquid and gasses.