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drain the oil right away your head gasket needs to be replaced. If you leave the mixed oil and antifreeze in the oil pan you will damage the crank and bearings at this point as long as you didn't over heat it to much you will be able to replace the head gasket and be on your way
The only place, oil and water share a gasket is the cylinder head gasket, oil and water galleries run through the engine block and head via the head gasket. The cylinder pressure will be OK, it's the oil pressure that's putting the oil in the coolant, the gasket has gone between the water and oil galleries or there is an internal crack (unlikely). A coolant pressure test should show it up.
did you have the head checked for cracks/leaks while it was off? it can only be head gasket, cracked head or cracked block that allows the engine oil to mix with the coolant. you could also see if combustion gas is in the coolant (should never be)
if there is a leak in the valve cover oil would leak out .
if there is a leak in head gasket could mix coolant and oil no leak out the mix would be in crank case,
or pressure would build up in radiator whit no mix whatsoever.
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yes and no, i wouldnt recomend it with aurora.. i had same leak from the oil pan and put in the bars and it stopped the leak for a couple weeks. after that it leaked the same as before. i would never use it again on any of my cars.. i had a friend put in new pan gasket and it stopped the leak... i believe this is pretty common with the aurora...is it 95?