You've already done the first step, running a compression test.
Next step is to get the valve cover off, look things over.
For it to suddenly lost all compression is a sign of a sudden failure, like a broken valve spring, stuck valve, seat come out, pushrod bent or broken.
Once the cover is off you can probably see the problem and determine if it can be repaired without pulling the head.
The coolant in the oil can be a head gasket, or it can be leaking orings at the bottom of the cylinder sleeves. I would suspect the orings if there were no other problems like overheating, coolant froth under the valve cover, or coming out the breather tube. Changing the orings is no small job. The liners will have to be removed and the bottom of the block thoroughly cleaned. If the rest of the engine is getting tired, might be time to do the whole job and be done with it.
If you are not going to replace the orings, and are taking the head off, be sure to clamp the liners down with bolts and flat washers. Otherwise they will ride up if the engine is turned. If any ride up, the seal will be broken and will for sure leak.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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