Water is getting into the oil from an internal leak. Try using some radiator stop leak, but if it gets worse it may be a blown head gasket or something serious.
The engine needs to be flushed.the coolant ports have a build up of gunk causing the engine to run hotter. The heated water expands to much causing it to over flow from the reserve tank.
Coolant is added to the plastic reservoir under the hood.
I added "external" to the question
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Coolant for the 98 Deville is added into the coolant overflow bottle. The side of the bottle should have low and high coolant markings.
You can buy coolant that is premixed and is added to the radiator without mixing.
they drank it and it was more bitter and they added chili to it
If you are absolutely sure there are no external leaks then you probably have a weak head gasket and the coolant is being pulled into the cylinders and burned with the fuel.Found after removing and replacing the sensor and bottle still had error finally drained radiator and added correct coolant mixture in radiator, indicator went away. Appear I had a weak mixture of coolant and water in radiator, which kept giving me the "ENGINE COOLANT LOW' I guess it really was low in coolantRead more: Why_does_your_jaguar_XJ8_say_engine_coolant_low_when_it_is_full
Sir Hans Soloane added milk to chocolate for the first time and invented chocolate milk. Yummy!
The cocao plant does not contain cholesterol, however chocolate can have cholesterol if milk is added to the chocolate mix.
After coolant is added run vehicle to normal operating temperature and re-check coolant level