Measure the compression on all the cylinders before starting a long
project that you may not need.If one is substantially lower of the
others you may have a blown gasket.
Drop a small amount of #50 oil on the cylinder with lower compression,
if compression goes back to normal you may need rings and in that case
you also have to replace the gasket.
Not cylinder compression... but rather coolant system pressurization... if
pressure drops but no external leak... then you know.
Other possible source of oil is tranny oil cooler which is usually combined
with the radiator... if the seal is blown... then tranny fluid is mixing
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