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Was the oil drained after the overheating occurred? You may have contamination from just before overheating. Did you find the root cause for it? Low coolant / no coolant, stuck thermostat, failed water pump, etc.
Or
The cylinder head job was done badly, did they use a new gasket, did they torque the nuts correctly?
Or
The cylinder head is fine, but the block is cracked.
No to both. The water pump is chain driven and takes water from one side and pumps it out under pressure from the other. The thermostat is fully enclosed in a housing with no access to oil.
Oil in Coolant only comes from a failed head gasket where the oil and water channels are in close proximity and under combustion pressure of hundreds of pounds.
Water pumps are designed to pump water through the engine, radiator, and heating system. Water pumps will not cause oil to enter the cooling system.Oct 4, 2016
Usually you start in the middle and alternately work your way out on any cylinder head.
https://www.google.com/search?q=Nissan+na20+cylinder+head&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiQgYrjoMDKAhXHGz4KHc4yDlYQ_AUIBygB&biw=1280&bih=873#tbm=isch&q=torque+sequence+Nissan+2.0+cylinder+head
You might have a cracked timing chain cover, blown head gasket, cracked block, or bad radiator if it has a built in oil cooler. It's hard to say without a cooling system pressure tester.
Do a compression test. You may have bad rings. That could allow oil inside the cylinder and fuel into the crank case. I don't know what the compression should be but all cylinders should be the same if not very, very close to one another. If one shows 100psi then the rest should show the same.
you need to go in to get a pre made mix of i don't no whats its called just say you blown head gasket and they will give you a mix in a little bottle witch you put in with the oil
sounds like you have a problem with the head or head gasket.Pulled out the spark plugs and see if you have any showing signs of leakage from head/gasket.
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