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Your hole in the oil pan is from some damage caused when the vehicle hit something over rough terrain, I am assuming since it is a 4x4. The mixture of water and oil is because you have some leak whether it is a blown gasket or maybe some hole internally in the engine. Do you notice a brownish foam at the end of the oil dipstick if you check the oil, that is usually a sign that water is seeping into the oil parts of the engine.
Bubbles coming up in your coolant resevoir tank, and either consistent or random overheating, could indicate a head gasket leak. Check your oil dipstick, and inside valve cover where you add oil. If engine oil looks like chocolate mousse, it's a sure indicator of head gasket leakage.
Hi Wendy, hope I am wrong but it sounds like a cracked head or blown head gasket.
If the engine hasn't been started in a couple hours pull the engine oil dipstick and look at the oil level. If the oil level is over the full mark you likely have water in the bottom of the oil pan. Milky/semi-white oil on the dipstick would indicate the same. If the oil looks good and at or below the full level look in the water overflow for the radiator. Any sign of oil or milky looking foam is an indication of oil in the water from cracked head/block or blown head gasket. If both the water and oil look good start the engine, let it warm up and look to see if you have water coming out of the exhaust pipe. It is normal to see some water come out of the exhaust after starting a cold engine due to condensation in the muffler and catalytic converter but a healthy engine should have only a slight amount of water vapor coming out of the exhaust. Anything more would indicate a cracked head/block or blown head gasket.
If there is water in the oil, it wouldn't last long under the heat/pressure of the engine, so if you are seeing water it must be super fresh. Are you losing coolant? If so, then i'd suspect water pump/water pump gasket if you never had that replaced. It could be head gasket, but you would probably experience a consistent coolant loss with maybe loss of power or misfiring. You can check with a pressure/leak down test for head gasket. Either way, if you are losing coolant I'd check water pump. If you aren't losing coolant than it can't be the water pump or head gasket really letting "water" in.
The FIRST thing you need to do is get a dipstick. The condensation in the valve cover is most likely from moisture getting drawn into the engine through the dipstick tube. Not to mention that it is also drawing unfiltered air in that can mess with your air-fuel ratio and act like sandpaper on your internal engine parts.
Also, if you are afraid that you may have water in your oil, you can check for water in the oil by taking the oil pan drain plug out.
Blown head gaskets don't make the engine run cold, they make them run HOT! (Over 240)
Blown head gaskets also do not make things come out of the valve cover. The valve cover is ABOVE the head gasket. Gravity makes liquids run downhill. You most likely just need to fix an oil leak at the valve cover.