Oil leaking into water overflow/radiator 1999 saturn

SOURCE: 1999 Saturn SL light green slim/sludge found in water

I have a 1997 saturn 1.9sohc and I noticed a brown sludge seeping out of the water res , but no water on oil dipstick. Washed out the resivior with a hose running for 10 min and it got alot of the sludge out, but the next day I checked the fluid and there is a quarter inch of oil on top of the water. it is creamy brownish white . its not overheating or causeing any problems yet but I am worried and broke what shold I do?

SOURCE: coolant light 2004 saturn ion 4 cylinder

I had the same problem. My 2004 Ion had 85000 miles on it. It was a bad sensor. The whole coolant reservoir tank needs to be replaced to fix the problem. This was covered under the extended warranty that we had. If you are doing this repair yourself, a hose clamp tool is recommended for simplicity.

SOURCE: 2000 saturn upper engine knocking

noise is caused by lack of oil to lifters, or worn timeing chain. if noise is from lifters it should go away wit proper oil level, if still there needs timeing chain.

SOURCE: OIL IN ANTIFREEZE

Everyone automatically assumes that oil and water mixing means a blown head gasket or cracked engine block. Of course common sense is usually not that common. Oil in coolant is a different problem than coolant in oil. The former is a low pressure leak, and could indicate only an intake manifold gasket. It could also be an early or small head gasket leak. Coolant in oil is usually a cracked block or torn head gasket, and has concomitant symptoms of white exhaust smoke and milky oil on dipstick. If you replace the head gasket and the problem persists, an intake gasket could have fixed the problem.

SOURCE: 2003 saturn vue 3.0 engine, replaced timing belt,

You could have a leaking water pump gasket. Did you put sealant on it when you replaced it? were ALL surfaces totally clean?