Oil in radiator dead miss in #3 cyl 1994 ford explorer 4X4 also runs hot in about 18 miles with ac on could this be a blown head gasket or something else

If the Jeep sits for long periods, you could have condensation in the engine. But if you drive it at least once or twice a week, I would expect to find a blown head gasket. The radiator should also be low on coolant.
It it is a leaking head gasket, you may be right on having low compression. The head could be cracked too.
Once the engine runs hot, the head gasket can stretch and stop sealing.

You have a blown cylinder head gasket. Engine needs to be taken apart.

Brown gunk is either oil from a blown head gasket or 'stop-leak'. The head gasket is expensive to fix.

If you have over 150,000 miles probably cheaper to replace the car if the head gasket is bad.

GL,
Td

Blown head gasket, you can add some aluma seal to your radiator some times this helps, never open radiator cap when engine is hot.

the head gasket is probably blown...thats why coolant and oil is mixing...

does it actually overheat or does the sensor just say its getting hot, its possible just the temp sensor could be bad, or other more major problems exist,ex. head gasket, blocked cores in radiator,

i think its going to be the head gasket duto the way its leaking coolant. one of the water jackets maybe i would have it checked to be sure but it sounds like head gasket

bad work done on head gasket have to redo

Most head gaskets don't get in the oil, just leak into the combustion chamber, your friend is probably right, have another shop confirm his diagnosis

A cracked block often results in oil in the antifreeze. A cracked head or blown gasket is often heard while accelerating plus it my chug or miss. Take it to another garage and get the system pressure tested. I am not sure if thats what you meant by "a carbonation test". Check for milky looking oil on the dipstick first. If its normal then have the garage inspect the head for leaks using an ultraviolet light around the heads. It may a clogged rad or a faulty water pump too, even a faulty rad cap. Let me know any more info when this is checked. I hate to see someone ripped off.