Oil in my collant tank? - 1992 Mercedes-Benz 190

Not that good although it could happen
You would need a leak inside the radatior between the oil colling system for the transmission and a leaking intake manifold gasket that is letting collant leak into the engine that has trany fluid nixed with it .Of coruse you would see oil floating on top of the antifreeze if you removed the radiator cap or the fluid res
. Also look at the engine oil for white foem this also means collant is getting into the engine oil white smoke out the exhaust sure sign you have a leak someware .

sounds like a head gasket problem.hope not,a big job.the coolant and the oil are meeting through a crack or split in the engine.again hope im wrong but would need attention soon

Milky oil usually indicates a leaking head gasket which is allowing coolant and oil to mix. How does your collant look?

Head Gasket Problem, or cracked head , the heat, then no heat is almost a dead giveaway. Good Luck

head gasket failure between piston seal and the cooling system causing pressure ,it will not show as water in oil but white smoke on start up from cold ,when it warms up it will tend to seal itself but eventually it will just keep boiling up

no it should be fine as long as you put collant in it and it is not leaking collant anywhere make sure collant topped off

Could be blown head or intake gasket or a bad thermostat or clogged radiator or heater core.

Make sure it is engine oil,and not transmission oil,If it does not run hot,and it is engine oil,the intake is most likely the problem.

Try replacing your radiator cap, also do not fill to the top. Water expands when hot. Expasion tank/coolant tank should normally be around half full.

you take the radiator cap off....fill it to the top. Fill the reservoir on the side to the fill mark....usually not much at all in it.