Unfortunately, you most likely need to suspect a bad head
gasket, which is allowing the coolant and oil to mix. Emulsified
oil on your oil dipstick, which appears as (usually) a light brown,
smeary emulsion, is another indicator. Also, your exhaust will
smell funny, like an overheated car.
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clay has a chemical in it that absorbs water.So it holds water
well.But it will not drain fast.