At first it was over heating in then one day i check the oil and looks like mud
Chances are you have a blown head gasket.
Since there is way more pressure from the oil pump than there is pressure in the cooling system oil can leak into the cooling system and coolant not leak back due to the pressure differential.It is very easy to have a head gasket leaking and not see where the leak was with a visual inspection after disassembly. I would inspect the head for cracks and if it is ok clean the block and head and have the head checked for warpage and if it is ok replace the head gasket and you should be good to go.
SOURCE: i have oil in coolant
It would appear that there is a problem with the head gasket not sealing properly around the point where the pressurised engine oil goes from the block to the head to lubricate the valve gear and is leaking into the engine water jacket and showing up in the coolant and collecting around the cap because oil is less dense than water. The problem could be caused by the engine having been overheated previously causing the head to warp slightly and allowing the oil to seep into the coolant.
The only fix would be to have the head removed and have it machined to return the mating face to dead flat and then replacing the head with a new gasket.
While the head is off it may pay to have the valves and seats checked for wear and the valve stem oil seals replaced as they go hard over time and become worn, especially as the engine is over 15 years old.
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