There is a white creamy substance around the oil cap what would cause this

Please remove your oil filler cap & see if there is a creamy deposit inside the cap or around the inside of the filler tube, if so unfortunately this is indicative of a blown head gasket.

Head gasket or gaskets is the coolant low I bet it is.

Hi it sounds your head gasket need's replaced ,,,As for the water creamy white that means that oil is getting in to your water .
The head gasket has gone water can get into oil
but it also oil can get into water can also
water can be lost down the exhaust.
Replace head gasket clean out radiator

check the inside of the engine oil cap to see if a creamy pudding like substance is stuck inside of it. If so the head gasket is lealing and ruined the cranks main bearings causing the knocking noise

Water in the oil. If it is running right and feels good going down the road then it ought to be ok but if you feel like its missing then chances are you blew a head gasket. I have known some vehicles that develope that white milky substance on the oil caps and blamed it on condensation mixing with the oil. Changing the oil cap usually cures that problem.

There is no sound, basically you will experience lack of power, also open engine oil cap and if there is creamy substance visible in the oil you most likely have blown a HEAD GASKET

You need to change your water-pump before it gets your engine damaged. this is only a sign that the water-pump is bad wherein water misses with the oil.

Treat this fast.

rate this too.

hate to be the bearer of bad news, but i think your head gasket has failed causing the oil & water to mix in the engine. usually, the water enters the oil causing the milky cream liquid (check the under side of the oil fill cap for this same creamy liquid) and you wind up adding coolant since it gets low.

if the coolant is not getting low, then it may not be anything to worry about. in the colder months, BMWs have been known to display this creamy liquid on the oil cap. it disappears when the weather gets warmer. BMW has a service bulletin on this.

have a compression check done on it to see if this is truely the case. i hope i am wrong. and 1 pint every 2-4 thousand miles is not too bad.

If you pull out the dipstick you will find this is also white, which is water in your oil. More than likely cyllinder head gasket.You will probably find it in your water bottle as well

Yes this is a potential problem,

1.) moisture from not changing your oil often or car was sitting.
2.) Head gasket is blown causing coolant to blow through into oil.

When you pull dip stick is there white creamy substance on the dipstick