Underneath the gas tank on my 04 636, theres a white tank, pretty sure its the coolant resivior or somthing, but it has a milkshake looking fluid in it, pretty sure its water and oil cos thats what happends when you mix the two, anybody know how or why it got that way??? and what i have to do to remedy it..?

 

possibly head gasket happends to cars all the tiime

 

i know, but its not in the oil window, that happends when you blow a head gasket, oil window's fine, looks like oil, but the resivor under the gas tank , has to bome kind of catch can or somthing, my the brazilian i bought it off of did some re routing of the hoses, ill take it apart when i get home... was jus wondering if anyone had this happen..?

 

hopefully your waterpump seal is still good.

 

check the radiator. If it has the same then you have motor damage from overheating. If not and it looks good then it is just old fluid in the overflow.

 

oil window will look fine because the oil outweighs the liquid. drain coolant and oil n see if it does it again